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Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Business And Significant Accounting Policies [Line Items]    
Provision for income taxes $ 34.1 $ (46.1)
ASU 2016-16 [Member]    
Business And Significant Accounting Policies [Line Items]    
Provision for income taxes 1.8  
Retained Earnings [Member] | ASU 2016-16 [Member]    
Business And Significant Accounting Policies [Line Items]    
Cumulative effect of retained earnings on new accounting principle adoption (72.7)  
Prepaid Expenses and Other Current Assets [Member] | ASU 2016-16 [Member]    
Business And Significant Accounting Policies [Line Items]    
Cumulative effect of retained earnings on new accounting principle adoption 3.9  
Other Assets [Member] | ASU 2016-16 [Member]    
Business And Significant Accounting Policies [Line Items]    
Cumulative effect of retained earnings on new accounting principle adoption 22.4  
Income Taxes Payable [Member] | ASU 2016-16 [Member]    
Business And Significant Accounting Policies [Line Items]    
Cumulative effect of retained earnings on new accounting principle adoption (2.0)  
Deferred Income Taxes [Member] | ASU 2016-16 [Member]    
Business And Significant Accounting Policies [Line Items]    
Cumulative effect of retained earnings on new accounting principle adoption 48.4  
Employee Severance [Member]    
Business And Significant Accounting Policies [Line Items]    
Restructuring Cost 170.0  
Cumulative restructuring cost 148.8  
Contract Terminations [Member]    
Business And Significant Accounting Policies [Line Items]    
Restructuring Cost 140.0  
Cumulative restructuring cost $ 134.9