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Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI Activity (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2020
May 31, 2019
May 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance $ (59.7) $ (55.7)  
Other comprehensive income (loss) before reclassifications 0.6 (4.7)  
Other comprehensive income (loss) 1.4 (4.0)  
Ending balance (58.3) (59.7) $ (55.7)
Pension and postretirement adjustments, tax portion 0.4 0.5 1.1
Foreign currency translation adjustments [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (47.1) (41.9)  
Other comprehensive income (loss) before reclassifications (2.9) (5.2)  
Amounts reclassified from Accumulated other comprehensive income (loss) 0.0 0.0  
Other comprehensive income (loss) (2.9) (5.2)  
Ending balance (50.0) (47.1) (41.9)
Recognized net actuarial loss [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Amounts reclassified from Accumulated other comprehensive income (loss) 0.8 0.7  
Pension Plans [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (13.1) (12.5)  
Other comprehensive income (loss) before reclassifications 2.5 (1.4)  
Other comprehensive income (loss) 3.5 (0.6)  
Ending balance (9.6) (13.1) (12.5)
Pension Plans [Member] | Recognized net actuarial loss [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Amounts reclassified from Accumulated other comprehensive income (loss) 1.0 0.8  
Postretirement Benefits [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 0.5 (1.3)  
Other comprehensive income (loss) before reclassifications 1.0 1.9  
Other comprehensive income (loss) 0.8 1.8  
Ending balance 1.3 0.5 $ (1.3)
Postretirement Benefits [Member] | Recognized net actuarial loss [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Amounts reclassified from Accumulated other comprehensive income (loss) $ (0.2) $ (0.1)