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Earnings Per Share - Additional Information (Detail) (Employee stock option and appreciation right plans)
In Millions, unless otherwise specified |
3 Months Ended | |
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Mar. 31, 2015
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Mar. 31, 2014
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Employee stock option and appreciation right plans
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Securities not included in the calculation of diluted earnings per share (in shares) | 0.2 | 0.2 |