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Defined Benefit Plans - Obligations and Funded Status (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
Sep. 30, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Change in the Projected Benefit Obligation (PBO):          
Recognition of actuarial losses (gains)   $ 2.5 $ (0.5) $ 1.9 $ 8.6
Change in Plan Assets:          
Fair value of plan assets at beginning of year     577.7    
Fair value of plan assets at end of year     656.6 577.7  
Pension Benefits [Member]          
Change in the Projected Benefit Obligation (PBO):          
Projected benefit obligation at beginning of year $ 767.7   791.7 767.7  
Service cost     0.6 9.6  
Interest cost     33.3 34.4  
Plan amendments       0.1  
Recognition of actuarial losses (gains)     40.6 11.7  
Benefits paid     (33.8) (31.8)  
Projected benefit obligation at end of year     832.4 791.7 767.7
Accumulated benefit obligation at end of year (excludes the impact of future compensation increases)     832.4 791.7  
Change in Plan Assets:          
Fair value of plan assets at beginning of year 561.9   577.7 561.9  
Actual return on plan assets     83.2 46.6  
Employer contributions     29.5 1.0  
Benefits paid     (33.8) (31.8)  
Fair value of plan assets at end of year     656.6 577.7 561.9
Funded status (Fair value of plan assets less PBO)     (175.8) (214.0)  
Postretirement Benefits [Member]          
Change in the Projected Benefit Obligation (PBO):          
Projected benefit obligation at beginning of year 15.6   3.6 15.6  
Interest cost       0.3  
Plan amendments 10.7     (12.3)  
Recognition of actuarial losses (gains) $ 0.9   (1.4) 1.6  
Benefits paid     (0.4) (1.6)  
Foreign exchange     (0.2)    
Projected benefit obligation at end of year     1.6 3.6 $ 15.6
Change in Plan Assets:          
Employer contributions     0.5 1.5  
Benefits paid     (0.5) (1.5)  
Funded status (Fair value of plan assets less PBO)     $ (1.6) $ (3.6)