Discontinued Operations and Assets and Liabilities Held For Sale (Components Of Discontinued Operations In Consolidated Statements Of Income) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Discontinued Operations and Disposal Groups [Abstract]
Operating revenues	$ 0	$ 0.9	$ 289.2
Operating expenses	3.7	9.9	297.0
Interest expense and other	0	0	0.7
Loss before income taxes	(3.7)	(9.0)	(8.5)
Income tax benefit	(1.3)	(3.1)	(3.4)
Loss from discontinued operations, net of tax	$ (2.4)	$ (5.9)	$ (5.1)