Income Taxes (Provision For Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Federal, Current	$ 0.0	$ 0.0	$ 0.0
Federal, Deferred	(34.0)	0.0	668.3
Federal, Total	(34.0)	0.0	668.3
Foreign, Current	130.6	128.5	173.9
Foreign, Deferred	3.8	(4.2)	(24.3)
Foreign, Total	134.4	124.3	149.6
State and other, Current	0.3	0.3	0.7
State and other, Deferred	0.0	0.0	0.6
State and other, Total	0.3	0.3	1.3
Total	$ 100.7	$ 124.6	$ 819.2