Income Taxes (Components of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Current tax expense (benefit):
Federal	$ (0.2)	$ (7.4)	$ (11.5)
State	(1.1)	0.5	(0.2)
Foreign	11.2	21.3	44.2
Deferred tax expense (benefit):
Federal	(20.1)	15.1	9.0
State	(0.5)	0.7	(0.6)
Foreign	(4.0)	(23.6)	(10.4)
Income tax expense (benefit)	$ (14.7)	$ 6.6	$ 30.5