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Stockholders' Equity - Roll forward of Retained Earnings (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Retained earnings beginning balance | $ 256.7 |
Net loss | (10.0) | $ (36.0)
Retained earnings ending balance | $ 246.7 |

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