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Stockholders' Equity and Equity Instruments, Fair Value, Exercise Price Range, and Accumulated Other Comprehensive Income (Details) (Stock Options [Member], USD $)
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3 Months Ended |
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Mar. 31, 2014
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| Fair value assumptions and methodology [Abstract] | |
| Lower limit of fair value of options granted (in dollars per share) | $ 14.08 |
| Upper limit of fair value of options granted (in dollars per share) | $ 16.23 |
| Exercise price (in dollars per share) | $ 87.18 |
| Lower limit of expected volatility (in hundredths) | 26.50% |
| Upper limit of expected volatility (in hundredths) | 28.80% |
| Dividend yield (in hundredths) | 3.40% |
| Risk-free rate of return lower limit (in hundredths) | 1.40% |
| Risk-free rate of return upper limit (in hundredths) | 1.60% |
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Minimum [Member]
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| Fair value assumptions and methodology [Abstract] | |
| Expected term (in years) | 4 years |
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Maximum [Member]
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| Fair value assumptions and methodology [Abstract] | |
| Expected term (in years) | 5 years |