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Stockholders' Equity (Details) - USD ($) shares in Millions, $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Oct. 11, 2018 | Sep. 30, 2018 | Aug. 31, 2018
Stockholders' Equity |  |  |
Authorized shares to be repurchased (in shares) |  |  | $ 150
Shares repurchased and retired (in shares) | 0.6 | 4.0 |

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