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Accounting Standards - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016		Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) in operating activities, Increase (decrease) in other assets	$ 1.4	$ (5.0)	[1]
Increase (decrease) in other investing activities	0.3	0.2	[1]
Increase (decrease) in other financing activities	(2.1)	(0.4)	[1]
Reclassification from operating activities, Decrease in accounts payable and other accrued liabiilities	(50.0)	(34.8)	[1]
Increase in Effect of exchange rate changes on cash, cash equivalents and restricted cash	6.3	5.5	[1]
Cash, cash equivalents and restricted cash, beginning of period	401.1	396.8	[1]
Cash, cash equivalents and restricted cash, end of period	335.5	547.6	[1]
Accounting Standards Update 2016-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) in other financing activities		(0.4)
Reclassification from operating activities, Decrease in accounts payable and other accrued liabiilities		0.4
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-15
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) in operating activities, Increase (decrease) in other assets		0.8
Increase (decrease) in other investing activities		$ (0.8)
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) in operating activities, Increase (decrease) in other assets	0.5
Increase (decrease) in other investing activities	1.2
Increase in Effect of exchange rate changes on cash, cash equivalents and restricted cash	0.5
Cash, cash equivalents and restricted cash, beginning of period	31.6
Cash, cash equivalents and restricted cash, end of period	$ 33.8
New Accounting Pronouncement, Early Adoption, Effect | Accumulated Deficit | Accounting Standards Update 2016-16
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment				$ 4.4
[1] Changed to conform to the current-year presentation. See Note 11.

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