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Equity (Stock Repurchase Program) (Details) - USD ($) $ / shares in Units, shares in Millions | 9 Months Ended
--- | ---
Sep. 30, 2021 | Sep. 30, 2020
Stock repurchase program |  |
Shares repurchased and retired during period (in shares) | 4.2 | 3.7
Common stock value repurchased including acquisition costs | $ 91,900,000 | $ 41,400,000
Average cost per share of repurchased shares (in dollars per share) | $ 21.70 | $ 11.32
Maximum |  |
Stock repurchase program |  |
Stock repurchase program, authorized amount | $ 50,000,000.0 |
Stock repurchase program remaining authorized amount | $ 30,900,000 |

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