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Other Post-Employment Benefits and Other Employee Benefit Plans - Reconciliation of Benefit Obligations, Plan Assets and Funded Status for Plans (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Change in benefit obligations:      
Benefit obligation at beginning of period $ 906.9 $ 978.9  
Service cost 4.3 7.0 $ 10.6
Interest cost 21.7 22.9 26.1
Actuarial (gain) loss (32.1) 27.8  
Benefits paid, net (34.1) (35.5)  
Loss due to exchange rate movements (35.1) 57.6  
Benefit obligation at end of period 815.6 906.9 978.9
Change in plan assets:      
Fair value of plan assets at beginning of period 776.2 771.8  
Employer contribution 15.7 28.1  
Benefits paid, net (34.1) (35.5)  
Fair value of plan assets at end of period 668.7 776.2 771.8
Net amount recognized:      
Underfunded status (146.9) (130.7)  
Accumulated benefit obligation at end of year 803.0 893.7  
Net amount recognized in consolidated balance sheets consists of:      
Current liability (2.3) (2.4)  
Non-current liability (171.9) (169.4)  
Net amount recognized (147.9) (132.7)  
Amounts recognized in accumulated other comprehensive loss consist of:      
Net actuarial loss 178.1 146.1  
Prior service credit 4.8 0.7  
Total 182.9 146.8  
Other Post-Employment Benefits and Other Employee Benefit Plans      
Change in benefit obligations:      
Benefit obligation at beginning of period 51.3 54.0  
Service cost 0.1 0.1 0.2
Interest cost 1.4 1.6 1.9
Actuarial (gain) loss (1.7) 1.0  
Benefits paid, net (4.5) (4.3)  
Settlement/curtailment 0.0 (1.2)  
Loss due to exchange rate movements 0.0 0.1  
Plan amendments (0.2) 0.0  
Benefit obligation at end of period 46.4 51.3 54.0
Change in plan assets:      
Fair value of plan assets at beginning of period 0.0 0.0  
Employer contribution 4.5 4.3  
Benefits paid, net (4.5) (4.3)  
Fair value of plan assets at end of period 0.0 0.0 $ 0.0
Net amount recognized:      
Underfunded status (46.4) (51.3)  
Accumulated benefit obligation at end of year 46.4 51.3  
Net amount recognized in consolidated balance sheets consists of:      
Current liability (5.3) (5.2)  
Non-current liability (41.1) (46.1)  
Net amount recognized (46.4) (51.3)  
Amounts recognized in accumulated other comprehensive loss consist of:      
Net actuarial loss 0.4 2.0  
Prior service credit (3.0) (3.1)  
Total $ (2.6) $ (1.1)