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Equity - Treasury Stock (Details) - USD ($) shares in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2017
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Treasury stock acquired | $ 11,953,000 | $ 173,913,000 |  |  |
Cash payments related to stock repurchases | $ 19,933,000 | $ 173,913,000 |  |  |
2017 and 2018 Repurchase Programs |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Treasury stock acquired (in shares) | 0.4 | 5.0 | 13.9 |  |
Treasury stock acquired | $ 12,000,000.0 | $ 173,900,000 | $ 451,300,000 |  |
2017 Repurchase Program |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Aggregate authorized amount of common stock to be repurchased (up to) |  |  |  |  | $ 300,000,000.0
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 | 286,800,000 |  |  |  |
Treasury Stock Associated with Deferred Compensation Plans |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Treasury stock acquired | $ 3,800,000 | $ 3,300,000 |  |  |
Common Stock Withheld for Settlement of Employee Tax Liabilities |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |
Treasury stock acquired (in shares) | 0.4 | 0.4 |  |  |
Treasury stock acquired | $ 15,300,000 | $ 13,400,000 |  |  |

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