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Pension and Other Postretirement Benefit Plans - Reconciliation of Change in Benefit Obligation, Change in Plan Assets and Amounts Recognized in Consolidated Balance Sheet (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
U.S. | Pension      
Change in benefit obligation      
Benefit obligation at beginning of period $ 548.2 $ 686.6  
Service cost 5.0 5.6 $ 4.7
Interest cost 21.8 29.8 28.7
Actuarial (gain) loss 8.6 3.5  
Benefits paid (25.6) (22.4)  
Lump sum payout 0.0 (154.9)  
Curtailment 0.0 0.0  
Special termination benefits 0.0 0.0  
Translation adjustment 0.0 0.0  
Benefit obligation at end of period 558.0 548.2 686.6
Change in plan assets      
Fair value of plan assets at beginning of period 412.6 522.1  
Actual return on plan assets 49.1 30.2  
Employer contributions 2.1 37.6  
Benefits paid (25.6) (22.4)  
Lump sum payout 0.0 (154.9)  
Translation adjustment 0.0 0.0  
Fair value of plan assets at end of period 438.2 412.6 522.1
Funded status (119.8) (135.6)  
Amounts recognized in the consolidated balance sheet      
Other long-term assets 0.1 0.0  
Accrued liabilities (2.1) (2.2)  
Other long-term liabilities (117.8) (133.4)  
U.S. | Other Postretirement      
Change in benefit obligation      
Benefit obligation at beginning of period 64.7 78.9  
Service cost 0.1 0.2 0.2
Interest cost 2.4 3.2 3.1
Actuarial (gain) loss (4.5) (12.8)  
Benefits paid (4.0) (4.8)  
Lump sum payout 0.0 0.0  
Curtailment (2.1) 0.0  
Special termination benefits 0.0 0.0  
Translation adjustment 0.0 0.0  
Benefit obligation at end of period 56.6 64.7 78.9
Change in plan assets      
Fair value of plan assets at beginning of period 0.0 0.0  
Actual return on plan assets 0.0 0.0  
Employer contributions 4.0 4.8  
Benefits paid (4.0) (4.8)  
Lump sum payout 0.0 0.0  
Translation adjustment 0.0 0.0  
Fair value of plan assets at end of period 0.0 0.0 0.0
Funded status (56.6) (64.7)  
Amounts recognized in the consolidated balance sheet      
Other long-term assets 0.0 0.0  
Accrued liabilities (4.2) (4.2)  
Other long-term liabilities (52.4) (60.5)  
Foreign      
Change in benefit obligation      
Benefit obligation at end of period 490.6    
Foreign | Pension      
Change in benefit obligation      
Benefit obligation at beginning of period 442.5 427.4  
Service cost 7.3 6.5 8.4
Interest cost 15.0 15.8 16.2
Actuarial (gain) loss 11.7 27.4  
Benefits paid (23.6) (29.1)  
Lump sum payout 0.0 0.0  
Curtailment 0.8 0.0  
Special termination benefits 0.0 0.0  
Translation adjustment 36.9 (5.5)  
Benefit obligation at end of period   442.5 427.4
Change in plan assets      
Fair value of plan assets at beginning of period 367.1 368.2  
Actual return on plan assets 28.2 21.1  
Employer contributions 7.5 8.5  
Benefits paid (23.6) (29.1)  
Lump sum payout 0.0 0.0  
Translation adjustment 27.2 (1.6)  
Fair value of plan assets at end of period 406.4 367.1 368.2
Funded status (84.2) (75.4)  
Amounts recognized in the consolidated balance sheet      
Other long-term assets 38.1 40.3  
Accrued liabilities (2.9) (2.7)  
Other long-term liabilities (119.4) (113.0)  
Foreign | Other Postretirement      
Change in benefit obligation      
Benefit obligation at beginning of period 38.8 36.5  
Service cost 0.5 0.5 0.7
Interest cost 1.5 1.6 1.7
Actuarial (gain) loss (0.7) 0.8  
Benefits paid (1.6) (1.9)  
Lump sum payout 0.0 0.0  
Curtailment (0.2) 0.0  
Special termination benefits 0.1 0.3  
Translation adjustment 2.8 1.0  
Benefit obligation at end of period 41.2 38.8 36.5
Change in plan assets      
Fair value of plan assets at beginning of period 0.0 0.0  
Actual return on plan assets 0.0 0.0  
Employer contributions 1.6 1.9  
Benefits paid (1.6) (1.9)  
Lump sum payout 0.0 0.0  
Translation adjustment 0.0 0.0  
Fair value of plan assets at end of period 0.0 0.0 $ 0.0
Funded status (41.2) (38.8)  
Amounts recognized in the consolidated balance sheet      
Other long-term assets 0.0 0.0  
Accrued liabilities (1.5) (1.5)  
Other long-term liabilities $ (39.7) $ (37.3)