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Other Post-Employment Benefits and Other Employee Benefit Plans - Funded Status for Pension Plans (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Change in benefit obligation:      
Projected benefit obligation at beginning of period $ 1,319.5 $ 1,369.5  
Service cost 10.6 11.3  
Interest cost 33.3 37.6  
Actuarial loss (gain) 98.8 11.7  
Benefits paid, net (46.6) (48.2)  
Loss due to exchange rate movements 71.0 88.0  
Projected benefit obligation at end of period 1,337.3 1,319.5 $ 1,369.5
Change in plan assets:      
Fair value of plan assets at beginning of period 970.0 1,044.0  
Employer contributions 25.2 28.7  
Benefits paid, net (46.6) (48.2)  
Fair value of plan assets at end of period 987.2 970.0 1,044.0
Net amount recognized:      
Underfunded status (350.1) (349.5)  
Accumulated benefit obligation at end of year 1,290.0 1,276.0  
Net amount recognized in consolidated balance sheets consists of:      
Current liability (4.2) (4.0)  
Noncurrent liability (369.9) (378.1)  
Net amount recognized (350.1) (348.4)  
Amounts recognized in accumulated other comprehensive income consist of:      
Net actuarial loss 367.9 362.1  
Prior service credit (2.1) 0.1  
Total 365.8 362.2  
Other Post-Employment Benefits and Other Employee Benefit Plans [Member]      
Change in benefit obligation:      
Projected benefit obligation at beginning of period 65.8 79.8  
Service cost 0.2 0.9 0.8
Interest cost 1.9 3.0 3.2
Actuarial loss (gain) (6.3) (4.7)  
Benefits paid, net (4.3) (4.1)  
Loss due to exchange rate movements   (0.6)  
Plan amendments (1.9) (8.5)  
Projected benefit obligation at end of period 55.5 65.8 $ 79.8
Change in plan assets:      
Employer contributions 4.3 4.1  
Benefits paid, net (4.3) (4.1)  
Net amount recognized:      
Underfunded status (55.5) (65.8)  
Accumulated benefit obligation at end of year 55.5 65.8  
Net amount recognized in consolidated balance sheets consists of:      
Current liability (3.0) (5.1)  
Noncurrent liability (52.5) (60.7)  
Net amount recognized (55.5) (65.8)  
Amounts recognized in accumulated other comprehensive income consist of:      
Net actuarial loss 2.4 8.6  
Prior service credit (17.9) (17.6)  
Total $ (15.5) $ (9.0)