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Derivative Financial Instruments - Contingent Features (Details) - USD ($)
$ in Millions
Nov. 30, 2020
Nov. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Derivative instrument liabilities with credit-risk-related contingent features $ 284.6 $ 42.9
Collateral posted (129.8) (3.1)
Collateral received 141.4 114.1
Return of and additional collateral required in the event of a credit rating downgrade below investment grade $ 296.2 $ 154.0