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Summary of Significant Accounting Policies Revenue Details (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
May 31, 2018
Feb. 28, 2019
Feb. 28, 2021
Feb. 28, 2020
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]        
Contract with Customer, Liability, Revenue Recognized $ 17.0      
Future Revenues   $ 19.2 $ 2.1 $ 0.5
Revenue, Remaining Performance Obligation $ 21.8