General (Details) - USD ($) $ in Millions	Apr. 30, 2021	Jan. 31, 2021	Oct. 31, 2020	Apr. 30, 2020	Jan. 31, 2020	Oct. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment upon adoption of accounting standards update	$ (6,162.8)	$ (5,989.9)	$ (3,824.8)	$ (3,627.5)	$ (3,730.9)	$ (3,628.6)
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment upon adoption of accounting standards update	$ (5,477.5)	$ (5,360.0)	(3,261.8)	$ (3,126.9)	$ (3,115.4)	$ (3,026.4)
Cumulative Effect, Period of Adoption, Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment upon adoption of accounting standards update			1.4
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment upon adoption of accounting standards update			$ 1.4