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Employee Benefit Plans (Details) - Schedule for measurement of benefit plan assets at fair value - Pension Plans - USD ($)
$ in Millions
May 31, 2021
May 31, 2020
May 31, 2019
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 40.8 $ 36.6  
Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.9 0.8  
U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4.7 3.7  
International      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 14.5 6.8  
Annuities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13.0 17.5  
Annuities      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 6.0 5.6  
Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 1.7 2.2  
U.K.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 40.8 36.6 $ 31.8
U.K. | Level 1      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 21.8 13.5  
U.K. | Level 1 | Cash and cash equivalents      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 0.9 0.8  
U.K. | Level 1 | U.S.      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 4.7 3.7  
U.K. | Level 1 | International      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 14.5 6.8  
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 1.7 2.2  
U.K. | Level 2      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets 13.0 17.5  
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 13.0 17.5  
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 6.0 5.6  
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 6.0 5.6  
U.K. | Level 3 | Real estate      
Defined Benefit Plan Disclosure [Line Items]      
Fair value of plan assets $ 0.0 $ 0.0