Stockholders' Equity and Equity Instruments (Details) (USD $)
In Millions, except Share data, unless otherwise specified | 9 Months Ended |
|---|
Sep. 30, 2011 | Sep. 30, 2010 |
|---|
| Range of Estimates and Calculated Fair Values [Abstract] | | | |
| Additional Tax Benefit from Equity Compensation Awards recorded as APIC | $ 1.9 | | |
| Compensation Expense Recorded during Period Pursuant to Stock-based Compensation Plans | 4.8 | | 4.1 |
| Accumulated Other Comprehensive Income [Line Items] | | | |
| Accumulated Other Comprehensive Income, Beginning Balance | 46.0 | | |
| Change in Period | (7.7) | | |
| Accumulated Other Comprehensive Income, Ending Balance | 38.3 | | |
Stock Options [Member] | | | |
| Range of Estimates and Calculated Fair Values [Abstract] | | | |
| Lower limit of fair value of options granted (per share) | $ 28.17 | | |
| Upper limit of fair value of options granted (per share) | $ 29.35 | | |
| Lower limit of exercise price (per share) | $ 86.47 | | |
| Upper limit of exercise price (per share) | $ 86.80 | | |
| Lower limit of expected term (in years) | 3 | | |
| Upper limit of expected term (in years) | 6 | | |
| Lower limit of expected volatility (in hundredths) | 42.70% | | |
| Upper limit of expected volatility (in hundredths) | 51.90% | | |
| Dividend yield (in hundredths) | 2.40% | | |
| Risk-free rate of return lower limit (in hundredths) | 1.40% | | |
| Risk-free rate of return upper limit (in hundredths) | 2.30% | | |
| Shares reissued from treasury stock | 61,013 | | |
| Stock-based Compensation Activity - Stock Options [Roll Forward] | | | |
| Stock Options Outstanding at Beginning of Period (in shares) | 621,374 | | |
| Stock Options Granted (in shares) | 71,709 | | |
| Stock Options Exercised (in shares) | (61,013) | [1] | |
| Stock Options Released from restriction (in shares) | 0 | [1] | |
| Stock Options Cancelled/Expired (in shares) | (3,436) | | |
| Stock Options Outstanding at End of Period (in shares) | 628,634 | | |
| Stock-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] | | | |
| Weighted-average Exercise Price at Beginning of Period (per share) | $ 47.19 | | |
| Weighted-average Exercise Price, Granted (per share) | $ 86.47 | | |
| Weighted-average Exercise Price, Exercised (per share) | $ 30.91 | [1] | |
| Weighted-average Exercise Price, Released from restriction (per share) | $ 0 | [1] | |
| Weighted-average Exercise Price, Cancelled/Expired (per share) | $ 70.74 | | |
| Weighted-average Exercise Price at End of Period (per share) | $ 53.12 | | |
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | | | |
| Award Vesting Period | 4Y | | |
| Options Expiration Period | 7Y | | |
| Weighted-average Grant Date Fair Value of Options | $ 29.02 | | |
RSUs [Member] | | | |
| Range of Estimates and Calculated Fair Values [Abstract] | | | |
| Shares reissued from treasury stock | 32,202 | | |
| Stock-based Compensation Activity - Stock Options [Roll Forward] | | | |
| RSUs and PSUs Outstanding at Beginning of Period (in shares) | 109,751 | | |
| RSUs and PSUs Granted (in shares) | 33,595 | | |
| RSUs and PSUs Exercised (in shares) | 0 | [1] | |
| RSUs and PSUs Released from restriction (in shares) | (32,202) | [1] | |
| RSUs and PSUs Cancelled/Expired (in shares) | (1,111) | | |
| RSUs and PSUs Outstanding at End of Period (in shares) | 110,033 | | |
| Stock-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] | | | |
| Weighted-average Fair Value at Beginning of Period (per share) | $ 64.03 | | |
| Weighted-average Fair Value, Granted (per share) | $ 86.47 | | |
| Weighted-average Fair Value, Exercised (per share) | $ 0 | [1] | |
| Weighted-average Fair Value, Released from restriction (per share) | $ 55.74 | [1] | |
| Weighted-average Fair Value, Cancelled/Expired (per share) | $ 71.47 | | |
| Weighted-average Fair Value at End of Period (per share) | $ 73.23 | | |
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | | | |
| Award Vesting Period | 3Y | | |
PSUs [Member] | | | |
| Range of Estimates and Calculated Fair Values [Abstract] | | | |
| Number of tranches | 3 | | |
| Performance period of each tranche (in years) | 1Y | | |
| Minimum percentage of earnings (in hundredths) | 0.00% | | |
| Maximum percentage of earnings (in hundredths) | 150.00% | | |
| Fair Value Measurement Method | To estimate the fair value of the PSUs on the grant date, the Company uses a Monte-Carlo simulation model, which simulates future stock prices of the Company as well as the companies comprising the Russell 3000 Index. This model uses historical stock prices to estimate expected volatility and the Company's correlation to the Russell 3000 Index. The risk free rate was determined using the same methodology as the option valuations discussed above. | | |
| Stock-based Compensation Activity - Stock Options [Roll Forward] | | | |
| RSUs and PSUs Outstanding at Beginning of Period (in shares) | 6,366 | | |
| RSUs and PSUs Granted (in shares) | 19,139 | | |
| RSUs and PSUs Exercised (in shares) | 0 | [1] | |
| RSUs and PSUs Released from restriction (in shares) | 0 | [1] | |
| RSUs and PSUs Cancelled/Expired (in shares) | (107) | | |
| RSUs and PSUs Outstanding at End of Period (in shares) | 25,398 | | |
| Stock-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] | | | |
| Weighted-average Fair Value at Beginning of Period (per share) | $ 86.51 | | |
| Weighted-average Fair Value, Granted (per share) | $ 93.82 | | |
| Weighted-average Fair Value, Exercised (per share) | $ 0 | [1] | |
| Weighted-average Fair Value, Released from restriction (per share) | $ 0 | [1] | |
| Weighted-average Fair Value, Cancelled/Expired (per share) | $ 93.82 | | |
| Weighted-average Fair Value at End of Period (per share) | $ 91.99 | | |
| Disclosure of Compensation Related Costs, Share-based Payments [Abstract] | | | |
| Award Vesting Period | 3Y | | |
Stock Payment [Member] | | | |
| Range of Estimates and Calculated Fair Values [Abstract] | | | |
| Shares reissued from treasury stock | 699 | | |
Director [Member] | Deferred Stock Units [Member] | | | |
| Range of Estimates and Calculated Fair Values [Abstract] | | | |
| Shares reissued from treasury stock | 11,172 | | |
Cumulative Foreign Currency Translation Adjustment [Member] | | | |
| Accumulated Other Comprehensive Income [Line Items] | | | |
| Accumulated Other Comprehensive Income, Beginning Balance | 64.8 | | |
| Change in Period | (13.9) | | |
| Accumulated Other Comprehensive Income, Ending Balance | 50.9 | | |
Unrealized Gain (Loss) on Cash Flow Hedges [Member] | | | |
| Accumulated Other Comprehensive Income [Line Items] | | | |
| Accumulated Other Comprehensive Income, Beginning Balance | (4.7) | | |
| Change in Period | 1.7 | | |
| Accumulated Other Comprehensive Income, Ending Balance | (3.0) | | |
Unrealized Gain (Loss) on Net Pension Costs [Member] | | | |
| Accumulated Other Comprehensive Income [Line Items] | | | |
| Accumulated Other Comprehensive Income, Beginning Balance | (14.1) | | |
| Change in Period | 4.5 | | |
| Accumulated Other Comprehensive Income, Ending Balance | $ (9.6) | | |
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