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Stockholders' Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Dividends Payable [Line Items] |  |  |  |  |  |  |
Cash dividends declared per common share (usd per share) |  | $ 0.08 | $ 0.08 | $ 0.07 | $ 0.07 | $ 0.23 | $ 0.21
Payments of common stock dividends |  | $ 4.8 | $ 4.8 | $ 4.2 | $ 4.2 | $ 13.8 | $ 12.6
Subsequent Event |  |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |  |
Cash dividends declared per common share (usd per share) | $ 0.08 |  |  |  |  |  |

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