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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 (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended |
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Dec. 31, 2012
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Pension Benefits
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| Defined Benefit Plan Disclosure [Line Items] | |
| Actuarial loss, taxes | $ 6.3 |
| Prior service cost, taxes | 0.5 |
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Other Benefits
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| Defined Benefit Plan Disclosure [Line Items] | |
| Actuarial loss, taxes | 0.4 |
| Prior service cost, taxes | $ (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, tax 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, Tax No definition available.
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| X | ||||||||||
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- Details
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