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New Accounting Pronouncements - Narrative (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jan. 01, 2018
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Increase (decrease) in net cash used in investing activities $ 24.7 $ (200.6) $ (322.3)  
Increase (decrease) in net cash provided by (used in) financing activities (294.3) 19.9 (444.8)  
Effect of exchange rate on cash, cash equivalents and restricted cash 17.3 (16.5) (39.1)  
Increase (decrease) in net cash provided by operating activities 217.9 127.2 666.0  
Accounting Standards Update 2016-18        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Increase (decrease) in net cash used in investing activities   (4.3) (0.5)  
Increase (decrease) in net cash provided by (used in) financing activities   (1.5)    
Effect of exchange rate on cash, cash equivalents and restricted cash   0.7 2.4  
Accounting Standards Update 2016-15        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Increase (decrease) in net cash used in investing activities   (5.6) 5.7  
Increase (decrease) in net cash provided by (used in) financing activities   (7.6) 8.3  
Increase (decrease) in net cash provided by operating activities   $ 2.0 $ 14.0  
Accounting Standards Update 2014-09 [Member] | Subsequent Event [Member]        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Cumulative effect of of applying the new revenue standard       $ 14.0
Operating Expense        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
New accounting pronouncement effect on operating results (15.1)      
Investment and Other (Expense ) Income, Net        
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]        
Effect on other non-operating income from the adoption of a new accounting pronouncement $ 15.1