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Effect of New Accounting Pronouncements - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jan. 01, 2016
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative effect on retained earnings $ 125.3      
Corporate income tax rate   21.00% 35.00% 35.00%
Benefit for income taxes   $ (196.5) $ (157.1) [1] $ (96.7) [1]
Net cash provided by operating activities   765.1 854.2 [1] 649.6 [1]
Cash paid for acquisitions, net of cash and restricted cash   784.8 376.1 [1] 243.4 [1]
Effect of changes in foreign exchange rates on cash, cash equivalents and restricted cash   (85.0) 72.0 [1] (107.6) [1]
Accounting Standards Update 2016-09 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Benefit for income taxes   15.0 $ 15.1 6.5
Accounting Standards Update 2016-18 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Net cash provided by operating activities       50.3
Cash paid for acquisitions, net of cash and restricted cash       15.6
Effect of changes in foreign exchange rates on cash, cash equivalents and restricted cash       $ 85.9
Accounting Standards Update 2018-02 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Cumulative effect on retained earnings   6.6    
Accounting Standards Update 2018-05 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Benefit for income taxes   $ 5.8    
[1] See Note 3 - Revenues from Contracts with Customers for additional information about the restatements related to Topic 606.