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Employee Benefit Plans - OPEB Narrative (Details) - Other Postretirement Benefit Plans, Defined Benefit [Member]
$ in Millions
12 Months Ended
Nov. 30, 2020
USD ($)
Nov. 30, 2019
USD ($)
employee
Nov. 30, 2018
USD ($)
Nov. 30, 2017
USD ($)
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Number of Participants | employee   46    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)   $ (1.1) $ (0.7) $ (0.8)
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation   0.1    
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation   0.1    
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components   0.1    
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components   $ 0.1    
Scenario, Forecast [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) $ (0.6)