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Discontinued Operations (Summary Of Income From Discontinued Operations) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Discontinued Operations and Disposal Groups [Abstract]                      
Revenues                 $ 19.5 $ 325.0 $ 596.4
Operating expenses                 39.5 372.0 577.6
Operating (loss) income before income taxes                 (20.0) (47.0) 18.8
Other income (expense)                 0.0 0.0 0.3
Income tax benefit                 7.7 (30.7) (20.2)
Impairment of Long-Lived Assets to be Disposed of, Net of Tax Benefit                 (120.6) (1,158.8) 0.0
Gain on disposal of discontinued operations, net                 4.3 37.3 (1.1)
DISCONTINUED OPERATIONS, NET $ (95.0) $ (23.3) $ (10.1) $ (0.2) $ (388.0) $ 9.2 $ (818.4) $ (2.0) $ (128.6) $ (1,199.2) $ (2.2)