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Equity (Share Repurchase Program) (Details) - USD ($) | 1 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 24, 2019 | Jun. 30, 2019 | Feb. 28, 2019 | Dec. 31, 2018 | Oct. 31, 2018 | Apr. 30, 2018 | Feb. 28, 2018
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Share repurchase program, authorized amount |  | $ 200,000,000 | $ 200,000,000 | $ 100,000,000 | $ 200,000,000 | $ 200,000,000 | $ 200,000,000
Treasury stock acquired (in shares) |  | 6,574,814 |  |  |  |  |
Treasury stock acquired, average price per share (in USD per share) |  | $ 46.59 |  |  |  |  |
Shares cancelled (in shares) |  | 5,000,000 |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |  |
Treasury stock acquired (in shares) | 605,229 |  |  |  |  |  |
Treasury stock acquired, average price per share (in USD per share) | $ 50.88 |  |  |  |  |  |

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