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Effect of New Accounting Pronouncements - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 01, 2016
Sep. 30, 2018
Sep. 30, 2017
 [1]
Sep. 30, 2018
Sep. 30, 2017
 [1]
Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Corporate income tax rate       21.00%   35.00%
Benefit for income taxes   $ (48.1) $ (41.2) $ (111.9) $ (107.8)  
Net cash provided by operating activities       504.6 593.2  
Effect of changes in foreign exchange rates on cash, cash equivalents and restricted cash       (52.1) $ 98.5  
Accounting Standards Update 2016-18 [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Net cash provided by operating activities       134.1    
Cash paid for acquisitions, net of cash and restricted cash       17.8    
Effect of changes in foreign exchange rates on cash, cash equivalents and restricted cash       71.6    
Accounting Standards Update 2014-09 [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Cumulative effect of adoption recognized as an increase to retained earnings $ 125.3          
Accounting Standards Update 2018-02 [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Increase in retained earnings       $ 6.6    
Accounting Standards Update 2018-05 [Member]            
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Benefit for income taxes   $ 4.7        
[1] See Note 3 - Revenues from Contracts with Customers for additional information about the restatements related to Topic 606.