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Shareholders' Equity - Additional Information (Details) - USD ($) |  |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 19, 2021 | Aug. 18, 2021 | May 19, 2021 | Feb. 17, 2021 | Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2020
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |
Treasury stock shares (in shares) |  |  |  |  | 18,497,000 |  |  |  |  |  | 16,685,000
Fair value of common stock repurchased |  |  |  |  | $ 673,902,000 |  |  |  |  |  | $ 591,338,000
Business combination, shares issued |  |  |  |  |  |  | 106,586 |  |  |  |
Business combination, total value |  |  |  |  |  |  | $ 4,900,000 |  |  |  |
Cash dividends paid |  | $ 0.0925 | $ 0.0925 | $ 0.0925 | $ 0.0925 | $ 0.0925 | $ 0.0925 | $ 0.085 | $ 0.085 | $ 0.085 |
Dividend paid |  | $ 26,100,000 | $ 26,100,000 | $ 26,100,000 | $ 26,126,000 | $ 26,063,000 | $ 26,092,000 | $ 24,089,000 | $ 24,084,000 | $ 23,902,000 |
Dividend payable per share | $ 0.1025 |  |  |  |  |  |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |
Dividend payable, record date | Nov. 03, 2021 |  |  |  |  |  |  |  |  |  |
Dividend payable date | Nov. 17, 2021 |  |  |  |  |  |  |  |  |  |
Second Accelerated Share Repurchase Agreement | Maximum |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares repurchased, authorized amount |  |  |  |  | $ 100,000,000.0 |  |  |  |  |  |
Accelerated Share Repurchase Agreement |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |
Treasury stock shares (in shares) |  |  |  |  | 21,795 | 232,243 | 1,557,815 |  |  |  |
Fair value of common stock repurchased |  |  |  |  | $ 1,100,000 | $ 11,400,000 | $ 70,000,000.0 |  |  |  |
Treasury stock, average cost per share |  |  |  |  | $ 52.26 | $ 49.11 | $ 44.95 |  |  |  |
Stock repurchase program, remaining authorized repurchase amount |  |  |  |  | $ 323,600,000 |  |  |  |  |  |

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