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Shareholders' Equity - Additional Information (Details) - USD ($) |  | 12 Months Ended | 84 Months Ended |
--- | --- | --- | --- | ---
May 17, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | May 01, 2019
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |
Shares repurchased, authorized amount |  |  |  | $ 100,000,000.0 |  |
Treasury stock shares (in shares) |  | 16,685,000 | 15,451,000 |  | 16,685,000 |
Fair value of common stock repurchased |  | $ 591,338,000 | $ 536,243,000 |  | $ 591,338,000 |
Stock repurchase program, remaining authorized repurchase amount |  | $ 406,200,000 |  |  | $ 406,200,000 |
Treasury stock, shares, acquired |  |  |  |  | 16,700,000 |
Accelerated Share Repurchase Agreement |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |
Treasury stock shares (in shares) |  | 1,234,417 | 1,087,914 |  | 1,234,417 |
Treasury stock, average cost per share |  | $ 44.63 | $ 35.55 |  |  |
Fair value of common stock repurchased |  | $ 55,100,000 | $ 38,700,000 | $ 80,000,000.0 | $ 55,100,000 |
Treasury stock, shares, acquired | 566,599 |  |  | 2,910,150 |  |
Maximum |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |
Shares repurchased, authorized amount |  | $ 100,000,000.0 |  |  | $ 100,000,000.0 | $ 372,500,000

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