Net Income Per Share (Schedule Of Basic And Diluted Net Income Per Share Calculations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net Income Per Share [Abstract]
(Loss) income from continuing operations	$ (63.3)	$ (47.1)	$ (21.0)	$ (8.0)	$ 11.9	$ 0.3	$ 23.5	$ 31.4	$ (139.4)	$ 67.1	$ 190.7
Discontinued operations, net of taxes							1.4	3.7		5.1	15.4
Net (loss) income	$ (63.3)	$ (47.1)	$ (21.0)	$ (8.0)	$ 11.9	$ 0.3	$ 24.9	$ 35.1	$ (139.4)	$ 72.2	$ 206.1
Weighted-average common shares outstanding					100.0	100.2	103.7	106.2	100.1	102.5	120.5
Dilutive effect of stock-based awards										0.8	2.2
Weighted average shares for diluted net income per share					100.4	100.7	104.6	107.4	100.1	103.3	122.7