Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Contingency [Line Items]
Income tax provision (benefit)	$ (69.6)	$ 1.8	$ (9.5)	$ (13.6)	$ (0.9)	$ (20.1)	$ (1.8)	$ (3.3)	$ (90.9)	$ (26.1)	$ (22.5)
Undistributed Earnings of Foreign Subsidiaries	48.7								48.7
Deferred tax assets, valuation allowance	67.6				7.1				67.6	7.1
Deferred tax assets, increase (decrease) in valuation allowance									60.5
Unrecognized tax benefits that would impact effective tax rate	8.1				2.0				8.1	2.0
Unrecognized tax benefits	11.5				6.2				11.5	6.2	$ 0.8
Unrecognized tax benefit that would not affect the tax rate upon favorable resolution	3.4								3.4
Internal Revenue Service (IRS)
Income Tax Contingency [Line Items]
Operating loss carryforwards	409.7				195.4				409.7	195.4
State and Local Jurisdiction
Income Tax Contingency [Line Items]
Operating loss carryforwards	26.5				13.4				26.5	13.4
Tax credit carryforwards	4.6				1.5				4.6	1.5
Federal and State
Income Tax Contingency [Line Items]
Adjustments to additional paid in capital, income tax benefit from share-based compensation									22.1
Domestic Tax Authority
Income Tax Contingency [Line Items]
Tax credit carryforwards	7.4				1.8				7.4	1.8
Deferred tax assets, valuation allowance	16.1				4.8				16.1	4.8
Foreign Tax Authority
Income Tax Contingency [Line Items]
Operating loss carryforwards	267.0				6.6				267.0	6.6
Deferred tax assets, valuation allowance	$ 51.5				$ 2.3				$ 51.5	2.3
Net Operating Losses
Income Tax Contingency [Line Items]
Income tax provision (benefit)										(56.0)
Net Operating Losses - Amount Recorded As A Current Receivable To Be Carried Back Against Prior Year Tax Returns
Income Tax Contingency [Line Items]
Income tax provision (benefit)										$ (14.7)