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Amount of Prior Service Cost and Actuarial Loss Included in Accumulated Other Comprehensive Loss that is Expected to Be Recognized in Net Periodic Benefit Cost (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended |
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Dec. 31, 2011
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Pension Benefits
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| Defined Benefit Plan Disclosure [Line Items] | |
| Actuarial loss, net of taxes of $5.8 for pension benefits and $0.4 for other benefits | $ 10.2 |
| Prior service cost, net of taxes of $0.3 for pension benefits and $(0.1) for other benefits | 0.5 |
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Other Benefits
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| Defined Benefit Plan Disclosure [Line Items] | |
| Actuarial loss, net of taxes of $5.8 for pension benefits and $0.4 for other benefits | 0.6 |
| Prior service cost, net of taxes of $0.3 for pension benefits and $(0.1) for other benefits | $ (0.1) |
| X | ||||||||||
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- Definition
Defined Benefit Plan, Actuarial Losses to be Amortized and Reclassified from Accumulated Other Comprehensive Income (Loss) to Net Pension Cost No definition available.
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| X | ||||||||||
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- Definition
Defined Benefit Plan, Prior Service Cost to be Amortized and Reclassified from Accumulated Other Comprehensive Income (Loss) to Net Pension Cost No definition available.
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| X | ||||||||||
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- Details
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