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Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Earnings Per Share [Abstract]    
Net income (loss) $ (34.6) $ (0.3)
Amount allocated to common stockholders (as percent) 100.00% 100.00%
Basic EPS:    
Basic and Diluted EPS $ (34.6) $ (0.3)
Net income (loss) allocated to common stockholders (shares) 88.1 87.6
Basic and diluted (per share) $ (0.39) $ 0.00
Securities excluded from calculation of diluted EPS (shares) 0.6 1.4