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Retirement Plans and Other Post-Retirement Benefits - Schedule of Change in Benefit Obligation and Plan Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Change in Plan Assets      
Fair value of plan assets at beginning of year $ 638.0    
Fair value of plan assets at end of year 594.9 $ 638.0  
Pension Benefits [Member]      
Change in Benefit Obligation      
Balance at beginning of year 577.6 487.7  
Service cost 11.6 10.4 $ 11.6
Interest cost 23.3 24.8 21.8
Plan amendments   3.6  
Actuarial (gain)/loss (34.8) 83.9  
Benefits paid (34.8) (31.5)  
Effect of currency rate changes (1.0) (1.3)  
Balance at end of year 541.9 577.6 487.7
Change in Plan Assets      
Fair value of plan assets at beginning of year 638.0 601.2  
Actual return on plan assets (10.3) 66.3  
Total contributions 2.0 2.0  
Benefits paid (34.8) (31.5)  
Fair value of plan assets at end of year 594.9 638.0 601.2
Funded status at end of year 53.0 60.4  
Other Benefits [Member]      
Change in Benefit Obligation      
Balance at beginning of year 59.8 54.8  
Service cost 1.4 1.5 2.9
Interest cost 2.0 2.5 2.1
Participant contributions 1.2 1.3  
Actuarial (gain)/loss (10.1) 4.5  
Benefits paid (3.3) (4.8)  
Balance at end of year 51.0 59.8 $ 54.8
Change in Plan Assets      
Total contributions 3.3 4.8  
Benefits paid (3.3) (4.8)  
Funded status at end of year $ (51.0) $ (59.8)