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Shareholders' Equity (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 13, 2014
Dividends per share (in dollars per share) | $ 0.80 | $ 0.76 | $ 0.76 |
Treasury stock, shares acquired (in shares) | 1,057,115 |  |  |
Treasury Stock, Value, Acquired, Cost Method | $ 32,100,000 | $ 15,000,000.0 |  |
Remaining authorized repurchase amount | $ 113,600,000 |  |  |
Share repurchase program 2015 |  |  |  |
Authorized repurchase amount |  |  |  | $ 500,000,000.0
Treasury stock, shares acquired (in shares) |  | 324,889 | 0 |

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