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Equity - Treasury Stock (Details) - USD ($) shares in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Aug. 31, 2020 | Sep. 30, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock acquired |  | $ 200,000,000 |  | $ 11,953,000 |  |  |  |
Repurchase of common stock | $ 0 |  | $ 0 |  | $ 200,000,000 | $ 20,092,000 |  |
2018 Repurchase Program |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Aggregate authorized amount of common stock to be repurchased (up to) |  |  |  |  |  |  |  | $ 500,000,000.0
Amount remaining under stock repurchase programs | 86,800,000 |  |  |  | 86,800,000 |  |  |
2020 Repurchase Program |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Aggregate authorized amount of common stock to be repurchased (up to) |  |  |  |  |  |  | $ 500,000,000 |
2018 and 2020 Repurchase Program |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Amount remaining under stock repurchase programs | 586,800,000 |  |  |  | 586,800,000 |  |  |
Treasury Stock Associated with Deferred Compensation Plans |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock acquired | 0 |  |  |  | 3,600,000 | 3,700,000 |  |
Common Stock Withheld for Settlement of Employee Tax Liabilities |  |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |  |
Treasury stock acquired | $ 800,000 |  | $ 600,000 |  | $ 24,500,000 | $ 16,700,000 |  |
Treasury stock acquired (in shares) |  |  |  |  | 0.6 | 0.5 |  |

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