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Derivative Financial Instruments (Contingent Features) (Details) - USD ($)
$ in Millions
May 31, 2020
Nov. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]    
Derivative instrument liabilities with credit-risk-related contingent features $ 180.9 $ 42.9
Collateral posted (139.3) (3.1)
Collateral received 50.9 114.1
Return of and additional collateral required in the event of a credit rating downgrade below investment grade $ 92.6 $ 154.0