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Retirement Plans and Other Post-Retirement Benefits - Information for Pension Plans with Accumulated Benefit Obligation in Excess of Plan Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2015
Dec. 31, 2014
Defined Benefit Plan, Pension Plans with Accumulated Benefit Obligations in Excess of Plan Assets [Abstract]    
Projected benefit obligation $ 36.1 $ 41.7
Accumulated benefit obligation 33.1 36.1
Fair value of plan assets $ 0.0 $ 0.0