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Share-Based Compensation - Summary of Activity Under Share-Based Compensation Plans (Parenthetical) (Detail)
In Millions, unless otherwise specified |
Mar. 31, 2013
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Dec. 31, 2012
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Market condition awards [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Outstanding SARs | 1.5 | 1.5 |
| Exercisable SARs | 1.5 | |
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Market and performance condition awards [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Outstanding SARs | 0.9 | 0.9 |
| X | ||||||||||
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- Definition
The number of exercisable stock appreciation rights (SARs). No definition available.
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| X | ||||||||||
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- Definition
The number of outstanding stock appreciation rights (SARs). No definition available.
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| X | ||||||||||
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- Details
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