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Employee Benefit Plans - Schedule for measurement of benefit plan assets at fair value (Details) - Pension Plans - USD ($)
$ in Millions
May 31, 2025
May 31, 2024
May 31, 2023
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 20.1 $ 21.4  
Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.8 0.9  
Pooled, Common and Collective Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7.6 9.3  
Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8.6 8.0  
Annuities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3.1 3.2  
U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 20.1 21.4 $ 19.6
U.K. | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.8 0.9  
U.K. | Level 1 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.8 0.9  
U.K. | Level 1 | Pooled, Common and Collective Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.K. | Level 1 | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.K. | Level 1 | Annuities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.K. | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 16.2 17.3  
U.K. | Level 2 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.K. | Level 2 | Pooled, Common and Collective Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 7.6 9.3  
U.K. | Level 2 | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8.6 8.0  
U.K. | Level 2 | Annuities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.K. | Level 3      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3.1 3.2  
U.K. | Level 3 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.K. | Level 3 | Pooled, Common and Collective Funds      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.K. | Level 3 | Fixed Income      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.K. | Level 3 | Annuities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 3.1 $ 3.2