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Stockholders' Equity - Roll forward of Retained Earnings (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Retained earnings beginning balance | $ 247.3 |
Net loss | (36.0) | $ (195.9)
Retained earnings ending balance | 211.3 |
Retained Earnings |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |
Retained earnings beginning balance | 247.3 | 562.3
Net loss | (36.0) | (195.9)
Distribution of MFS |  | 51.8
Retained earnings ending balance | $ 211.3 | $ 418.2

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