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Effect of New Accounting Pronouncements - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jan. 01, 2016
Mar. 31, 2018
Mar. 31, 2017
 [1]
Dec. 31, 2017
Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Corporate income tax rate   21.00%   35.00%  
Effect of changes in foreign exchange rates on cash, cash equivalents and restricted cash   $ 38.7 $ 19.2    
Accounting Standards Update 2016-18 [Member]          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Net cash provided by operating activities         $ 154.2
Cash paid for acquisitions, net of cash and restricted cash         7.9
Effect of changes in foreign exchange rates on cash, cash equivalents and restricted cash         $ 12.2
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      
[1] See Note 3 - Revenues from Contracts with Customers for additional information about the restatements related to ASC 606.