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Income Taxes - Reconciliation between the Expected Provision for Income taxes at the US Federal Statutory Rate and the Provision for Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2021 | Oct. 31, 2023 | Oct. 31, 2022 | Oct. 31, 2021
Income Tax Disclosure [Abstract] |  |  |  |
Provision for income taxes at United States statutory tax rate |  | $ 86.7 | $ 99.8 | $ 103.2
Foreign earnings in jurisdictions with different tax rates |  | 7.0 | (22.3) | (43.6)
Foreign earnings subject to United States tax |  | 34.3 | 21.1 | 25.4
Excess tax benefits from share-based compensation |  | (2.4) | (2.6) | (13.0)
Intra-group transfer to UK subsidiary |  | 0.0 | 0.0 | (1,987.8)
Remeasurement of deferred tax assets from UK rate change | $ (536.7) | 0.0 | 0.0 | (536.7)
Change in unrecognized tax benefits |  | 0.0 | (12.7) | (7.6)
State tax provision |  | (4.2) | 5.0 | 0.8
Other, net |  | (2.7) | 1.2 | 6.1
Provision for income taxes |  | $ 118.7 | $ 89.5 | $ (2,453.2)

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