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Discontinued Operations (Summary of Income From Discontinued Operations) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Discontinued Operations and Disposal Groups [Abstract]        
Revenues $ 8.1 $ 99.1 $ 17.7 $ 219.4
Operating expenses 11.3 114.9 33.2 251.6
Operating loss before income taxes (3.2) (15.8) (15.5) (32.2)
Income tax (expense) benefit (2.9) (6.5) 9.2 (11.5)
Loss on impairment, net (7.2) (796.8) (7.2) (796.8)
Gain (loss) on disposal of discontinued operations, net 3.2 0.7 3.2 20.1
Income (loss) from discontinued operations $ (10.1) $ (818.4) $ (10.3) $ (820.4)