v3.25.2
Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI Activity (Details) - USD ($)
$ in Millions
 3 Months Ended
Aug. 31, 2025
Aug. 31, 2024
May 31, 2025
May 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Beginning balance $ (41.5)      
Other comprehensive income (loss) 3.8 $ 8.4    
Ending balance (37.7) (44.1)    
Reclassification adjustment from AOCI, tax 0.0 0.0    
Amortization of prior service credit, tax 0.1 0.1    
Total stockholders’ equity 878.0 957.3 $ 946.5 $ 1,018.1
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Other comprehensive income (loss) before reclassifications 3.5 8.2    
Other comprehensive income (loss) 3.8 8.4    
Total stockholders’ equity (37.7) (44.1) (41.5) (52.5)
Foreign currency translation adjustments        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Other comprehensive income (loss) before reclassifications 3.5 8.2    
Other comprehensive income (loss) 3.5 8.2    
Amortization of prior service credit, tax 0.0 0.0    
Total stockholders’ equity (32.5) (38.7) (36.0) (46.9)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0.0 0.0    
Retirement benefit plans        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Other comprehensive income (loss) before reclassifications 0.0 0.0    
Other comprehensive income (loss) 0.3 0.2    
Total stockholders’ equity (5.2) (5.4) $ (5.5) $ (5.6)
Amortization of net actuarial (gain) loss (net of tax of $0.0)        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 0.4 0.3    
Amortization of prior service (credit) cost (net of tax of $0.1)        
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]        
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax $ (0.1) $ (0.1)