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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, 2023
May 31, 2022
May 31, 2021
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 19.6 $ 30.4  
Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1.0 0.3  
U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1.1 2.4  
International      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4.7 14.7  
Annuities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8.2 7.1  
Annuities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3.3 4.2  
Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1.3 1.7  
U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 19.6 30.4 $ 40.8
U.K. | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8.1 19.1  
U.K. | Level 1 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1.0 0.3  
U.K. | Level 1 | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1.1 2.4  
U.K. | Level 1 | International      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4.7 14.7  
U.K. | Level 1 | Annuities      
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 1 | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1.3 1.7  
U.K. | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8.2 7.1  
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 | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.K. | Level 2 | International      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.K. | Level 2 | Annuities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 8.2 7.1  
U.K. | Level 2 | Annuities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.K. | Level 2 | Real estate      
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 3.3 4.2  
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 | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.0 0.0  
U.K. | Level 3 | International      
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 0.0 0.0  
U.K. | Level 3 | Annuities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 3.3 4.2  
U.K. | Level 3 | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0.0 $ 0.0