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Employee Benefit Plans - Schedule of net periodic costs (Details) - USD ($)
$ in Millions
 3 Months Ended
Aug. 31, 2024
Aug. 31, 2023
Pension Plans | Foreign Plan    
Components of net periodic benefit (credit) cost:    
Interest cost $ 0.4 $ 0.4
Expected return on assets (0.3) (0.3)
Net amortization of prior service credit 0.0 0.0
Amortization of (gain) loss 0.3 0.3
Net periodic benefit (credit) cost 0.4 0.4
Post-Retirement Benefits    
Components of net periodic benefit (credit) cost:    
Interest cost 0.1 0.1
Expected return on assets 0.0 0.0
Net amortization of prior service credit (0.2) (0.2)
Amortization of (gain) loss (0.0) 0.0
Net periodic benefit (credit) cost $ (0.1) $ (0.1)