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Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2025
May 31, 2024
May 31, 2023
Accumulated Other Comprehensive Loss      
Balance $ 1,189.8 $ 1,099.1 $ 1,034.5
Accumulated Other Comprehensive Income (Loss), Net of Tax (5.6) (8.8)  
Total other comprehensive income (loss) 3.2 14.7 (3.9)
Balance 1,211.6 1,189.8 1,099.1
Currency Translation Adjustments      
Accumulated Other Comprehensive Loss      
Balance (5.5) (5.7) (2.8)
Other comprehensive income (loss) before reclassifications 3.1 0.2 (2.9)
Amounts reclassified from AOCL 0.0    
Total other comprehensive income (loss) 3.1 0.2 (2.9)
Balance (2.4) (5.5) (5.7)
Pensions Plans      
Accumulated Other Comprehensive Loss      
Balance (3.3) (17.8) (16.8)
Other comprehensive income (loss) before reclassifications 0.3 (0.3) 0.7
Amounts reclassified from AOCL (0.2) 14.8 (1.7)
Total other comprehensive income (loss) 0.1 14.5 (1.0)
Balance (3.2) (3.3) (17.8)
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Loss      
Balance (8.8) (23.5) (19.6)
Other comprehensive income (loss) before reclassifications 3.4 (0.1) (2.2)
Amounts reclassified from AOCL (0.2) 14.8 (1.7)
Total other comprehensive income (loss) 3.2 14.7 (3.9)
Balance $ (5.6) $ (8.8) $ (23.5)