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Equity - Treasury Stock (Details) - USD ($) shares in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Aug. 31, 2020 | Sep. 30, 2018 | Jun. 30, 2017
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Value of treasury stock acquired, cost method | $ 249,949,000 | $ 11,954,000 | $ 451,290,000 |  |  |
Cash payments related to stock repurchases | 247,249,000 | 20,092,000 | 443,152,000 |  |  |
2017 Repurchase Program |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Aggregate authorized amount of common stock to be repurchased |  |  |  |  |  | $ 300,000,000.0
2018 Repurchase Program |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Aggregate authorized amount of common stock to be repurchased |  |  |  |  | $ 500,000,000.0 |
2020 Repurchase Program |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Aggregate authorized amount of common stock to be repurchased |  |  |  | $ 500,000,000.0 |  |
2018 And 2020 Repurchase Program |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Remaining authorized share repurchase amount under repurchase program | 536,800,000 |  |  |  |  |
Treasury Stock Associated with Deferred Compensation Plans |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Net amounts recorded to treasury stock related to the deferred compensation plans | $ (4,400,000) | $ 3,000,000.0 | $ 2,500,000 |  |  |
Common Stock Withheld for Settlement of Employee Tax Liabilities |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Treasury stock acquired (in shares) | 0.6 | 0.5 | 0.4 |  |  |
Value of treasury stock acquired, cost method | $ 25,500,000 | $ 17,400,000 | $ 15,200,000 |  |  |

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