Employee Retirement Plans - Summary and Reconciliation of Beginning and Ending Balances of Fair Value of Plans' Assets (Detail) - USD ($) $ in Millions |
12 Months Ended | |
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Dec. 31, 2015 |
Dec. 31, 2014 |
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| Change in plan assets | ||
| Fair value of plan assets, beginning of year | $ 638.2 | |
| Fair value of plan assets, end of year | 594.8 | $ 638.2 |
| Pension Benefits [Member] | ||
| Change in plan assets | ||
| Fair value of plan assets, beginning of year | 638.2 | 659.4 |
| Actual return (loss) on plan assets | (5.3) | 40.1 |
| Foreign currency translation adjustment | (1.9) | (1.1) |
| Employer contribution | 2.0 | 2.0 |
| Gross benefits paid | (37.7) | (38.2) |
| Settlements | (0.5) | (24.0) |
| Fair value of plan assets, end of year | 594.8 | 638.2 |
| OPEB Benefits [Member] | ||
| Change in plan assets | ||
| Employer contribution | 7.8 | 7.8 |
| Plan participants' contributions | 1.4 | 1.4 |
| Gross benefits paid | $ (9.2) | $ (9.2) |
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- Definition The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. No definition available.
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- Definition The increase in the fair value of plan assets from contributions made by the employer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The amount of contributions made by plan participants. This item represents a periodic increase to the plan obligation and an increase to plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The amount that relates to an irrevocable action that relieves the employer (or the plan) of primary responsibility for a benefit obligation and eliminates significant risks related to the obligation and the assets used to effect the settlement. Examples of transactions that constitute a settlement include (a) making lump-sum cash payments to plan participants in exchange for their rights to receive specified benefits and (b) purchasing nonparticipating annuity contracts. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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