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Stockholders' Equity - Stockholders equity roll forward (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Schedule of Capitalization, Equity [Line Items] |  |
Retained earnings beginning balance | $ 539.5 |
Distribution of MFS | (204.0) | $ (8.4)
Distribution of MFS | 50.8 |
Retained earnings beginning balance | 386.3 |
Retained Earnings |  |
Schedule of Capitalization, Equity [Line Items] |  |
Retained earnings beginning balance | 539.5 | 486.9
Distribution of MFS | (204.0) | (8.4)
Retained earnings beginning balance | $ 386.3 | $ 478.5

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