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Schedule of Changes in Benefit Obligations, Plan Assets and Funded Status of Defined Benefit Pension and Post-Retirement Benefit Plans (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Change in fair value of plan assets      
Plan assets at beginning of year $ 785.6    
Plan assets at end of year 873.8 $ 785.6  
Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Accumulated benefit obligation (ABO) at December 31 921.8 894.3  
Change in projected benefit obligations (PBO)      
PBO at beginning of year (895.8) (892.9)  
Service cost (1.8) (1.8) $ (1.9)
Interest cost (30.0) (30.6) (37.6)
Plan amendments   (0.7)  
Actuarial loss including assumption changes (54.3) (31.0)  
Benefits paid 59.2 61.2  
PBO at end of year (922.7) (895.8) (892.9)
Change in fair value of plan assets      
Plan assets at beginning of year 787.0 759.0  
Actual return on plan assets 116.5 57.0  
Contribution by the company 30.5 32.2  
Benefits paid (59.2) (61.2)  
Plan assets at end of year 874.8 787.0 759.0
Funded status (47.9) (108.8)  
Current liabilities (0.5) (0.5)  
Non-current liabilities (47.4) (108.3)  
Net pension liability at end of year [1] (47.9) (108.8)  
Net actuarial loss (gain) 451.8 473.5  
Prior service cost (0.5) (0.9)  
Total recognized in accumulated other comprehensive loss 451.3 472.6  
Post-Retirement Benefits      
Change in projected benefit obligations (PBO)      
PBO at beginning of year (6.6) (6.6)  
Service cost (0.1) (0.1) (0.1)
Interest cost (0.3) (0.2) (0.3)
Participant contributions (0.1)    
Actuarial loss including assumption changes (1.1) (0.2)  
Benefits paid 0.6 0.5  
PBO at end of year (7.6) (6.6) $ (6.6)
Change in fair value of plan assets      
Contribution by the company 0.4 0.5  
Participant contributions 0.1    
Benefits paid (0.5) (0.5)  
Funded status (7.6) (6.6)  
Current liabilities (0.3) (0.4)  
Non-current liabilities (7.3) (6.2)  
Net pension liability at end of year (7.6) (6.6)  
Net actuarial loss (gain) (0.8) (2.0)  
Prior service cost (2.6) (2.9)  
Total recognized in accumulated other comprehensive loss $ (3.4) $ (4.9)  
[1] In addition, the Company has a liability for a foreign pension plan of $0.2 million and $0.2 million at December 31, 2017 and 2016, respectively.