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Accumulated Other Comprehensive Income (Loss) - Reclassification out of AOCI (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2025
May 31, 2024
May 31, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other components of net periodic benefit (cost) $ 1.1 $ 1.0 $ (0.3)
Tax (benefit) expense 0.6 4.1 25.9
Net income (loss) (1.9) 12.1 86.5
Pension Plans | Amount reclassified from Accumulated other comprehensive income (loss)      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net income (loss) 1.4 1.3 0.5
Postretirement Benefits | Amount reclassified from Accumulated other comprehensive income (loss)      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net income (loss) (0.7) (0.6) (0.6)
Amortization of prior service (credit) loss | Pension Plans | Amount reclassified from Accumulated other comprehensive income (loss)      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other components of net periodic benefit (cost) 0.0 0.0 0.0
Amortization of prior service (credit) loss | Postretirement Benefits | Amount reclassified from Accumulated other comprehensive income (loss)      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other components of net periodic benefit (cost) (0.8) (0.8) (0.8)
Amortization of net actuarial loss (gain) | Pension Plans | Amount reclassified from Accumulated other comprehensive income (loss)      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other components of net periodic benefit (cost) 1.4 1.3 0.5
Amortization of net actuarial loss (gain) | Postretirement Benefits | Amount reclassified from Accumulated other comprehensive income (loss)      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other components of net periodic benefit (cost) (0.1) 0.0 0.0
Tax (benefit) expense | Pension Plans | Amount reclassified from Accumulated other comprehensive income (loss)      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Tax (benefit) expense 0.0 0.0 0.0
Tax (benefit) expense | Postretirement Benefits | Amount reclassified from Accumulated other comprehensive income (loss)      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Tax (benefit) expense $ 0.2 $ 0.2 $ 0.2