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Stockholders' Equity - Dividends (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended
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Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Dividend amount per Class A and Class B share (in dollars per share) | $ 0.31 | $ 0.31 | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.29 | $ 0.29 | $ 0.29 | $ 0.29 | $ 0.27
Total amount of dividends paid (in millions) | $ 8.2 | $ 7.1 | $ 6.8 | $ 7.0 | $ 6.9 | $ 7.0 | $ 7.0 | $ 6.7 | $ 6.8 | $ 7.0 | $ 7.2 | $ 6.7

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