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Net Income Per Share (Schedule of Income Per Share) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Income Per Share Calculation [Line Items]                    
Net income (loss) allocable to common stockholders $ 33.6 $ (10.5) $ (24.4) $ 6.6 $ (8.2) $ (41.3) $ (2.9) $ (14.6) $ 5.3 $ (67.0)
Weighted average number of shares outstanding, basic                 9.1 9.1
Weighted average number of shares outstanding, diluted                 9.1 9.1
Net income (loss) per share - basic and diluted         $ (0.90) $ (4.54) $ (0.32) $ (1.60) $ 0.58 $ (7.36)