Basis of Presentation - 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 provision	$ (29.1)	$ (48.5)	$ (52.5)	$ (75.2)
New Accounting Pronouncement, 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect on retained earnings, net of tax			5.2
Impact on other current assets			5.4
Deferred tax liability, intra-entity transfer, asset other than inventory	0.2		0.2
New Accounting Pronouncement, 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Income tax provision	$ 10.5		37.5
New Accounting Pronouncement, 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Change in restricted cash			$ 139.4