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Retirement Plans and Other Post-Retirement Benefits - Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Pension Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial (gain) loss $ 21.5 $ 61.5  
Plan amendments   3.6  
Amortization of prior service cost (3.1) (3.3) $ (3.1)
Amortization of actuarial losses (17.1) (12.1) (21.1)
Total recognized in other comprehensive (income) loss 1.3 49.7  
Total recognized in net periodic benefit cost and other comprehensive (income) loss 10.4 56.4  
Other Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial (gain) loss (10.1) 4.5  
Amortization of prior service cost 0.3 0.3 0.5
Amortization of actuarial losses (0.2) (0.4) $ (0.6)
Total recognized in other comprehensive (income) loss (10.0) 4.4  
Total recognized in net periodic benefit cost and other comprehensive (income) loss $ (6.7) $ 8.5