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Benefit Costs Included in Accumulated Other Comprehensive Loss that have not yet Recognized in Net Periodic Pension Cost (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified |
Dec. 31, 2011
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Dec. 31, 2010
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|---|---|---|
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Pension Benefits
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| Defined Benefit Plan Disclosure [Line Items] | ||
| Prior service cost, accumulated taxes | $ 0.9 | $ 1.3 |
| Net actuarial loss, accumulated taxes | 165.6 | 130.6 |
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Other Benefits
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| Defined Benefit Plan Disclosure [Line Items] | ||
| Prior service cost, accumulated taxes | (0.4) | (0.4) |
| Net actuarial loss, accumulated taxes | $ 6.0 | $ 7.1 |
| X | ||||||||||
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- Definition
Accumulated Other Comprehensive Income (Loss) Defined Benefit Pension and Other Postretirement Plans Net Actuarial Gain (Loss) Tax No definition available.
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| X | ||||||||||
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- Definition
Defined Benefit Plan, Accumulated Other Comprehensive Income, Net Prior Service Cost (Credit), Tax No definition available.
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| X | ||||||||||
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- Details
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