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Summary of Significant Accounting Policies - Contract Assets and Liabilities and Remaining Performance Obligations (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
May 31, 2020
Feb. 29, 2020
May 31, 2020
May 31, 2019
May 31, 2018
May 31, 2017
Contract Assets and Liabilities            
Contract assets - current $ 49.3   $ 49.3 $ 59.2    
Contract assets - non-current 22.4   22.4 17.0    
Deferred revenue - current (11.2)   (11.2) (12.6)    
Deferred revenue on long-term contracts (88.0)   (88.0) (83.8)    
Net contract liabilities (27.5)   (27.5) (20.2)    
Change in contract assets - current     (9.9)      
Change in contract assets - non-current     5.4      
Change in contract liabilities - current     1.4      
Change in contract liabilities - non-current     (4.2)      
Net contract liabilities     (7.3)      
Contracts charge     31.3      
Forward loss reserves 22.1   22.1 16.0 $ 7.5 $ 4.9
Change in Contract with Customer, Liability            
Deferred revenue at beginning of period     (96.4) (44.1)    
Revenue deferred     (417.2) (364.7)    
Revenue recognized     410.5 306.6    
Other     3.9 5.8    
Deferred revenue at end of period (99.2)   (99.2) $ (96.4)    
Remaining Performance Obligations            
Remaining performance obligation $ 1,000.0   $ 1,000.0      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-05-31            
Remaining Performance Obligations            
Remaining performance obligation (as a percent) 50.00%   50.00%      
Expected timing of satisfaction of remaining performance obligation 12 months   12 months      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-05-31            
Remaining Performance Obligations            
Remaining performance obligation (as a percent) 60.00%   60.00%      
Expected timing of satisfaction of remaining performance obligation 3 years   3 years      
PBH contracts            
Contract Assets and Liabilities            
Contracts charge $ 6.6 $ 24.7 $ 31.3      
Reduction in revenue due to contract termination and restructuring     17.3      
Forward loss reserves 5.4   5.4      
Other related charges     8.6      
Forward loss reserves classified as current in accrued liabilities 3.1   3.1      
Forward loss reserves classified as long-term in other liabilities $ 2.3   $ 2.3