Income Taxes - Income Tax (Benefit) Expense Rate Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
U.S. federal statutory tax rate		35.00%	35.00%	35.00%
Taxes computed at U.S. statutory rate		$ (16.8)	$ (80.3)	$ (10.8)
State income taxes, net of federal benefit		0.1	(3.6)	0.8
Net change in reserve		(24.1)	27.5	1.5
Change in valuation allowances		68.4	72.6	0.2
Provision for tax on undistributed foreign earnings	$ (29.7)	26.8	5.0	(3.7)
Change of tax rate		11.8	(1.0)	(0.5)
Impact of transaction costs		(24.5)	40.5	6.5
Purchase price contingency		1.3	0.4	6.6
Settlement of Series B Convertible Preferred Stock		(34.3)	0.0	0.0
Goodwill impairment		6.2	0.0	0.0
Other, net		1.9	8.2	0.4
Income tax expense (benefit)		$ 28.6	$ 75.1	$ (6.7)
Effective tax rate		(59.50%)	(32.80%)	21.70%
Foreign
Income Taxes [Line Items]
Tax on foreign operations		$ (17.2)	$ (25.3)	$ (12.5)
Provision for tax on undistributed foreign earnings	(24.9)
Domestic
Income Taxes [Line Items]
Tax on foreign operations		$ 29.0	$ 31.1	$ 4.8
Provision for tax on undistributed foreign earnings	$ (4.8)