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Discontinued Operations (Summary of Income From Discontinued Operations) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2016
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2016
Dec. 31, 2015
Discontinued Operations and Disposal Groups [Abstract]                
Revenues $ 0.0   $ 8.1       $ 0.0 $ 17.7
Operating expenses 1.6   11.3       2.4 33.2
Operating loss before income taxes (1.6)   (3.2)       (2.4) (15.5)
Income tax (expense) benefit 0.4   (2.9)       0.3 9.2
Loss on impairment, net 0.0   (7.2)       0.0 (7.2)
Gain (loss) on disposal of discontinued operations, net 1.0   3.2       1.0 3.2
Income (loss) from discontinued operations $ (0.2) $ (0.2) $ (10.1) $ (10.1) $ (1.1) $ (10.3) $ (1.1) $ (10.3)