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Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI Activity (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2019
May 31, 2018
May 31, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance $ (55.7) $ (94.2)  
Other comprehensive income (loss) before reclassifications (4.7) 3.6  
Other comprehensive income (loss) (4.0) 38.5  
Ending balance (59.7) (55.7) $ (94.2)
Pension and postretirement adjustments, tax portion 0.5 1.1 22.0
Foreign currency translation adjustments [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (41.9) (45.3)  
Other comprehensive income (loss) before reclassifications (5.2) 3.4  
Other comprehensive income (loss) (5.2) 3.4  
Ending balance (47.1) (41.9) (45.3)
Lump sum settlement charge [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Amounts reclassified from Accumulated other comprehensive income (loss)   33.0  
Recognized net actuarial loss [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Amounts reclassified from Accumulated other comprehensive income (loss) 0.7 1.9  
Service cost [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Amounts reclassified from Accumulated other comprehensive income (loss)   0.0  
Pension Plans [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (12.5) (46.9)  
Other comprehensive income (loss) before reclassifications (1.4) (0.4)  
Other comprehensive income (loss) (0.6) 34.4  
Ending balance (13.1) (12.5) (46.9)
Pension Plans [Member] | Lump sum settlement charge [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Amounts reclassified from Accumulated other comprehensive income (loss)   33.0  
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) 0.8 1.8  
Pension Plans [Member] | Service cost [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Amounts reclassified from Accumulated other comprehensive income (loss)   0.0  
Postretirement Benefits [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (1.3) (2.0)  
Other comprehensive income (loss) before reclassifications 1.9 0.6  
Other comprehensive income (loss) 1.8 0.7  
Ending balance 0.5 (1.3) $ (2.0)
Postretirement Benefits [Member] | Lump sum settlement charge [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Amounts reclassified from Accumulated other comprehensive income (loss)   0.0  
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) $ (0.1) 0.1  
Postretirement Benefits [Member] | Service cost [Member]      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Amounts reclassified from Accumulated other comprehensive income (loss)   $ 0.0