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Stockholders' Equity (Details 2) - USD ($) shares in Millions, $ in Millions |  | 3 Months Ended
--- | --- | ---
Oct. 31, 2021 | Jun. 30, 2021 | Dec. 31, 2020
2020 Accelerated share repurchase program |  |  |
Accelerated share repurchases |  |  |
Accelerated share repurchase program, upfront payment |  |  | $ 50.0
Repurchase and retirement of common stock under repurchase program, shares |  | (0.1) | (2.6)
Repurchase and retirement of common stock under repurchase program |  |  | $ (40.0)
Remaining initial payment, unsettled forward contract indexed to Company's stock |  |  | $ 10.0
2021 Accelerated share repurchase program |  |  |
Accelerated share repurchases |  |  |
Accelerated share repurchase program, upfront payment |  | $ 100.0 |
Repurchase and retirement of common stock under repurchase program, shares | (0.4) | (3.9) |
Repurchase and retirement of common stock under repurchase program |  | $ (80.0) |
Remaining initial payment, unsettled forward contract indexed to Company's stock |  | $ 20.0 |

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