|
Stock-Based Compensation (Details) (USD $)
In Millions, except Share data, unless otherwise specified
|
3 Months Ended |
9 Months Ended |
|
Sep. 30, 2014
|
Sep. 30, 2013
|
Sep. 30, 2014
|
Sep. 30, 2013
|
| Stock-based compensation, additional disclosures [Abstract] |
|
|
|
|
|
|
| Stock-based compensation expense |
$ 2.4 |
|
$ 2.3 |
$ 6.5 |
|
$ 5.8 |
| Income tax benefit related to stock-based compensation expense |
0.7 |
|
0.8 |
2.2 |
|
2.1 |
| Intrinsic value of options exercised computed as the market price on the exercise date less the price paid to exercise the options |
0.2 |
|
0 |
0.4 |
|
4.1 |
| Cash received from exercise of options |
0.1 |
|
0 |
0.2 |
|
3.2 |
| Tax benefit recorded as credits to additional paid-in capital related to stock-based compensation transactions |
1.2 |
|
0.6 |
1.4 |
|
2.2 |
| Shares of common stock available for grant under stock-based incentive plans (in shares) |
1,900,000 |
|
|
1,900,000 |
|
|
| Aggregate intrinsic value of restricted stock units that are expected to vest |
28.2 |
|
|
28.2 |
|
|
| Unrecognized compensation expense related to non-vested restricted stock units, expected to be recognized over a weighted-average period of 1.91 years |
21.0 |
|
|
21.0 |
|
|
| Aggregate intrinsic value of stock options outstanding, all fully vested |
$ 0.7 |
|
|
$ 0.7 |
|
|
|
Restricted Stock Units [Member]
|
|
|
|
|
|
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| Summary of Restricted Stock Units Activity [Roll Forward] |
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|
|
|
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| Outstanding at beginning of period (in shares) |
|
|
|
948,844 |
|
|
| Granted (in shares) |
|
|
|
538,462 |
[1] |
|
| Exercised (in shares) |
|
|
|
0 |
|
|
| Vested (in shares) |
|
|
|
(461,521) |
|
|
| Forfeited (in shares) |
|
|
|
(11,565) |
|
|
| Expired (in shares) |
|
|
|
0 |
|
|
| Outstanding at end of period (in shares) |
1,014,220 |
|
|
1,014,220 |
|
|
| Weighted Average Measurement Date Fair Value [Abstract] |
|
|
|
|
|
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| Outstanding at beginning of period (in dollars per share) |
|
|
|
$ 16.55 |
|
|
| Granted (in dollars per share) |
|
|
|
$ 27.75 |
[1] |
|
| Exercised (in dollars per share) |
|
|
|
$ 0 |
|
|
| Vested (in dollars per share) |
|
|
|
$ 16.29 |
|
|
| Forfeited (in dollars per share) |
|
|
|
$ 18.92 |
|
|
| Expired (in dollars per share) |
|
|
|
$ 0 |
|
|
| Outstanding at end of period (in dollars per share) |
$ 22.59 |
|
|
$ 22.59 |
|
|
| Stock-based compensation, additional disclosures [Abstract] |
|
|
|
|
|
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| Unrecognized compensation expense, weighted-average period of recognition (in years) |
|
|
|
1 year 10 months 28 days |
|
|
|
Stock Options [Member]
|
|
|
|
|
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| Summary of Stock Option activity [Roll Forward] |
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| Outstanding at beginning of period (in shares) |
|
|
|
75,000 |
|
|
| Granted (in shares) |
|
|
|
0 |
|
|
| Exercised (in shares) |
|
|
|
(30,000) |
|
|
| Vested (in shares) |
|
|
|
0 |
|
|
| Forfeited (in shares) |
|
|
|
0 |
|
|
| Expired (in shares) |
|
|
|
0 |
|
|
| Outstanding at end of period (in shares) |
45,000 |
[2] |
|
45,000 |
[2] |
|
| Weighted Average Exercise Price [Abstract] |
|
|
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|
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| Outstanding at beginning of period (in dollars per share) |
|
|
|
$ 12.07 |
|
|
| Granted (in dollars per share) |
|
|
|
$ 0 |
|
|
| Exercised (in dollars per share) |
|
|
|
$ 12.09 |
|
|
| Vested (in dollars per share) |
|
|
|
$ 0 |
|
|
| Forfeited (in dollars per share) |
|
|
|
$ 0 |
|
|
| Expired (in dollars per share) |
|
|
|
$ 0 |
|
|
| Outstanding at end of period (in dollars per share) |
$ 12.05 |
|
|
$ 12.05 |
|
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| Stock-based compensation, additional disclosures [Abstract] |
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| Weighted average remaining contractual term (in years) |
|
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|
0 years 11 months 1 day |
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