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Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI Activity (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2025
May 31, 2024
May 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance $ 1,018.1 $ 1,164.5  
Ending balance 946.5 1,018.1  
Pension and postretirement adjustments, tax portion 1.8 2.0 $ 2.2
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (52.5) (55.8)  
Other comprehensive income (loss) before reclassifications 10.3 2.6  
Other comprehensive income (loss) 11.0 3.3  
Ending balance (41.5) (52.5)  
Foreign currency translation adjustments      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (46.9) (50.0)  
Other comprehensive income (loss) before reclassifications 10.9 3.1  
Less: amount reclassified from Accumulated other comprehensive income (loss) (net of taxes) 0.0 0.0  
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, Tax 0.0 0.0  
Other comprehensive income (loss) 10.9 3.1  
Ending balance (36.0) (46.9)  
Amortization of net actuarial loss      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Less: amount reclassified from Accumulated other comprehensive income (loss) (net of taxes) 1.3 1.3  
Amortization of prior service (credit) cost      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Less: amount reclassified from Accumulated other comprehensive income (loss) (net of taxes) (0.6) (0.6)  
Pension Plans | Accumulated Defined Benefit Plans Adjustment Attributable to Parent      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (11.8) (12.4)  
Other comprehensive income (loss) before reclassifications (0.6) (0.7)  
Other comprehensive income (loss) 0.8 0.6  
Ending balance (11.0) (11.8)  
Pension Plans | Amortization of net actuarial loss      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Less: amount reclassified from Accumulated other comprehensive income (loss) (net of taxes) 1.4 1.3  
Pension Plans | Amortization of prior service (credit) cost      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Less: amount reclassified from Accumulated other comprehensive income (loss) (net of taxes) 0.0 0.0  
Postretirement Benefits | Accumulated Defined Benefit Plans Adjustment Attributable to Parent      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 6.2 6.6  
Other comprehensive income (loss) before reclassifications 0.0 0.2  
Other comprehensive income (loss) (0.7) (0.4)  
Ending balance 5.5 6.2  
Postretirement Benefits | Amortization of net actuarial loss      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Less: amount reclassified from Accumulated other comprehensive income (loss) (net of taxes) (0.1) 0.0  
Postretirement Benefits | Amortization of prior service (credit) cost      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Less: amount reclassified from Accumulated other comprehensive income (loss) (net of taxes) $ (0.6) $ (0.6)