Income Taxes (Effective Income Tax Rate Reconciliation) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Income tax expense (benefit) at Federal statutory tax rate	$ (13.6)	$ (34.3)	$ (52.9)
Foreign tax rate differential	6.2	2.5	13.2
U.S. tax reform	(16.2)	0.0	0.0
Permanent difference	5.6	1.5	2.8
Impact of divestitures and liquidations (net of valuation allowances)	16.4	(9.0)	(14.2)
Change in uncertain tax positions	3.7	9.0	(8.8)
Withholding tax and surcharges	3.5	3.0	4.3
Change in valuation allowance	6.6	26.8	39.0
Other (net)	3.6	(3.2)	1.8
Income tax expense (benefit)	$ 15.8	$ (3.7)	$ (14.8)