Discontinued Operations And Assets And Liabilities Held For Sale (Components Of Discontinued Operations In Condensed Consolidated Statements Of Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating revenues	$ 0	$ 94.5	$ 0.9	$ 243.0
Operating expenses	2.1	91.7	8.6	246.6
Interest expense and other	0	0.2	0	0.4
Income (loss) before income taxes	(2.1)	2.6	(7.7)	(4.0)
Income tax expense (benefit)	(0.8)	0.9	(2.8)	(1.7)
Income (loss) from discontinued operations, net of tax	$ (1.3)	$ 1.7	$ (4.9)	$ (2.3)