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Restructuring Costs - Schedule of Accrued Restructuring Costs Activity (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]    
Beginning balance $ 67.2  
Restructuring costs, net 10.9 $ 5.4
Payments (19.2)  
Reclassification [1] (12.9)  
Foreign Currency and Other (1.3)  
Ending balance 44.7  
Employee Severance, Termination Benefits and Relocation Costs [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning balance 20.6  
Restructuring costs, net 7.0  
Payments (11.3)  
Foreign Currency and Other (0.5)  
Ending balance 15.8  
Exited Contractual Commitments and Other [Member]    
Restructuring Cost and Reserve [Line Items]    
Beginning balance 46.6  
Restructuring costs, net 3.9  
Payments (7.9)  
Reclassification [1] (12.9)  
Foreign Currency and Other (0.8)  
Ending balance $ 28.9  
[1] Reclassification due to the adoption of ASU 2016-02 (see Footnote 1)