Earnings (Loss) Per Share and Shareholder’s Equity (Schedule Of Reconciliation Of The Numerator And Denominator Of The Basic And Diluted Earnings (Loss) Per Share (EPS) Computations) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Earnings Per Share
Basic	92.8	95.6	93.6	96.1
Stock-based compensation arrangements	0.7	0.7	0.8	0.7
Convertible Debt, Share	6.3	6.8	6.3	6.8
Diluted EPS	99.8	103.1	100.7	103.6
Income	$ 34.8	$ 37.7	$ 112.5	$ 115.5
Income, Diluted EPS	$ 34.8	$ 37.7	$ 112.5	$ 115.5
Income (loss), per basic share	$ 0.38	$ 0.39	$ 1.20	$ 1.20
Stock-based compensation arrangements, per share	0.00	0.00	(0.01)	(0.01)
Convertible debt, per share	(0.03)	(0.03)	(0.07)	(0.08)
Income (loss), per diluted share	$ 0.35	$ 0.36	$ 1.12	$ 1.11
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	$ 0.0	$ 10.0	$ 0.0	$ 10.0
Income (loss) from discontinued operations, Diluted EPS	$ 0.0	$ 10.0	$ 0.0	$ 10.0
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share	$ 0.00	$ 0.11	$ 0.00	$ 0.11
Stock-based compensation arrangements discontinued operations, per share	0.00	0.00	0.00	0.00
Convertible Debt, Discontinued Operations, Per Share	0.00	(0.01)	0.00	(0.01)
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share	0.00	0.10	0.00	0.10
Net basic earnings (loss) per share	$ 0.38	$ 0.50	$ 1.20	$ 1.31
Stock-based compensation arrangements Per Share, Total	0.00	0.00	(0.01)	(0.01)
Interest On Convertible Debt Discontinuing Operation Per Share Total	$ (0.03)	$ (0.04)	$ (0.07)	$ (0.09)
Net diluted earnings (loss) per share	$ 0.35	$ 0.46	$ 1.12	$ 1.21