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Discontinued Operations (Summary Of Income From Discontinued Operations) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]                      
Revenues                 $ 0.0 $ 19.5 $ 325.0
Operating expenses                 3.1 39.5 372.0
Operating (loss) income before income taxes                 (3.1) (20.0) (47.0)
Income tax benefit                 (10.1) (7.7) 30.7
Impairment of Long-Lived Assets to be Disposed of, Net of Tax Benefit                   120.6 1,158.8
Gain on disposal of discontinued operations, net                 1.1 4.3 37.3
DISCONTINUED OPERATIONS, NET $ 9.9 $ (0.7) $ (0.2) $ (0.9) $ (95.0) $ (23.3) $ (10.1) $ (0.2) $ 8.1 $ (128.6) $ (1,199.2)