Schedule of Income Tax Provision (Benefit) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Components Of Income Tax Expense Benefit Continuing Operations Abstract
Current: Federal	$ (0.8)	$ 0.5	$ (60.7)
Current: State	(1.3)	(1.5)	(0.4)
Current: Foreign	6.2	14.4	9.4
Total Current	4.1	13.4	(51.7)
Deferred: Federal	2.4	(115.8)	(90.9)
Deferred: State	(14.4)	(3.5)	30.4
Deferred: Foreign	1.1	(1.0)	0.1
Total Deferred	(10.9)	(120.3)	(60.4)
Income tax benefit	$ (6.8)	$ (106.9)	$ (112.1)