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Effect of New Accounting Pronouncements - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Income tax benefit recognized $ (33.4) $ (18.2) $ (48.9) $ (20.4)
Reclassification of payments from investing activities to operating activities     205.4 129.4
Reclassification of payments from investing activities to financing activities     119.0 15.4
Restatement Adjustment [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Reclassification of payments from investing activities to operating activities       15.6
Reclassification of payments from investing activities to financing activities       30.7
Accounting Standards Update 2016-09 [Member]        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]        
Income tax benefit recognized $ 1.9 $ 2.5 $ 10.1 $ 3.1