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Amounts Recognized in Other Comprehensive Income (Loss) (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | |
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Dec. 31, 2012
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Dec. 31, 2011
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Pension Benefits
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| Defined Benefit Plan Disclosure [Line Items] | ||
| Net actuarial loss (gain), taxes | $ 21.8 | $ 39.2 |
| Prior service (credit) cost, taxes | 2.8 | |
| Recognized actuarial loss, taxes | (5.9) | (4.4) |
| Amortization of prior service cost, taxes | (0.3) | (0.3) |
| Curtailments, taxes | (10.6) | |
| Settlements, taxes | (19.5) | |
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Other Benefits
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| Defined Benefit Plan Disclosure [Line Items] | ||
| Net actuarial loss (gain), taxes | (0.8) | (0.6) |
| Recognized actuarial loss, taxes | (0.4) | (0.5) |
| Amortization of prior service cost, taxes | $ 0.1 | $ 0.1 |
| X | ||||||||||
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- Definition
Other Comprehensive Income Change In Unamortized Prior Service Credit Tax No definition available.
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- Definition
Tax effect of the income statement impact of the reclassification adjustment for curtailments as a component of net period benefit cost. No definition available.
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- Definition
Tax effect of the income statement impact of the reclassification adjustment for settlements as a component of net period benefit cost. No definition available.
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- Details
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| X | ||||||||||
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- Definition
Tax effect of the income statement impact of the reclassification adjustment for prior service costs recognized as a component of net period benefit cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tax effect of the increase (decrease) in the value of the projected benefit obligation and the (increase) decrease in the value of the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption that has not been recognized in net periodic benefit cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Tax effect of the income statement impact of the reclassification adjustment for actuarial gain (loss) recognized as a component of net periodic benefit cost. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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