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Discontinued Operations and Assets and Liabilities Held For Sale (Components Of Discontinued Operations In Consolidated Statements Of Income) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Discontinued Operations and Disposal Groups [Abstract]      
Operating revenues $ 0.0 $ 0.0 $ 0.9
Operating expenses 4.0 3.7 9.9
Loss before income taxes (4.0) (3.7) (9.0)
Income tax benefit (1.5) (1.3) (3.1)
Loss from discontinued operations, net of tax $ (2.5) $ (2.4) $ (5.9)