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Discontinued Operations (Summary Of Income From Discontinued Operations) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]                      
Revenues                 $ 0.0 $ 0.0 $ 19.5
Operating expenses                 1.5 3.1 39.5
Operating (loss) income before income taxes                 (1.5) (3.1) (20.0)
Income tax benefit                 (2.1) (10.1) (7.7)
Impairment of Long-Lived Assets to be Disposed of, Net of Tax Benefit                   0.0 (120.6)
Gain on disposal of discontinued operations, net                 0.4 1.1 4.3
DISCONTINUED OPERATIONS, NET $ 1.4 $ (0.2) $ 0.4 $ (0.6) $ 9.9 $ (0.7) $ (0.2) $ (0.9) $ 1.0 $ 8.1 $ (128.6)