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Employee Retirement Plans - Schedule of Projected Benefit Obligation and Fair Value of Plan Assets for Pension Plans Having Projected Benefit Obligations in Excess of Fair Value of Plan Assets (Detail) - Pension Benefits [Member] - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
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Defined Benefit Plan Disclosure [Line Items] |  |
Projected benefit obligation, end of year | $ 737.0 | $ 786.8
Fair value of plan assets, end of year | $ 594.8 | $ 638.2

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