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Stockholders' Equity - Roll forward of Retained Earnings (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Retained earnings beginning balance |  |  | $ 539.5 |
Net (loss) income | $ (4.9) | $ 23.3 | (212.4) | $ 14.9
Distribution of MFS |  |  | 51.2 |
Retained earnings ending balance | 378.3 |  | 378.3 |
Retained Earnings |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Retained earnings beginning balance |  |  | 539.5 | 486.9
Net (loss) income |  |  | (212.4) | 14.9
Retained earnings ending balance | $ 378.3 | $ 501.8 | $ 378.3 | $ 501.8

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