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Stockholders' Equity - Roll forward of Retained Earnings (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Retained earnings beginning balance |  |  | $ 256.7 |
Net income | $ 11.5 | $ 9.6 | 11.2 | $ (25.9)
Retained earnings ending balance | $ 267.9 |  | $ 267.9 |

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