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Net Income Per Share and Stockholders' Equity Net Income Per Share and Stockholders' Equity, Share Repurchases (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Equity [Abstract] |  |  |  |
Weighted-average repurchase price (dollars per share) |  | $ 96.18 | $ 100.28 | $ 82.97
Total cost of repurchased common shares | [1] | $ 42.9 | $ 61.9 | $ 77.8
[1] | Weighted-average repurchase price (dollars per share) for the years ended December 31, 2019, December 31, 2018 and December 31, 2017 was $96.18, $100.28 and $82.97, respectively. At December 31, 2019, $105.6 million remained available to repurchase our common shares pursuant to the stock repurchase program.

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