Income Taxes (Provision For Income Taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Federal, Current	$ 0.0	$ 0.0	$ 0.0
Federal, Deferred	0.0	668.3	207.9
Federal, Total	0.0	668.3	207.9
Foreign, Current	128.5	173.9	309.3
Foreign, Deferred	(4.2)	(24.3)	(11.4)
Foreign, Total	124.3	149.6	297.9
State and other, Current	0.3	0.7	(0.4)
State and other, Deferred	0.0	0.6	39.9
State and other, Total	0.3	1.3	39.5
Total	$ 124.6	$ 819.2	$ 545.3