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Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI Activity (Details) - USD ($)
$ in Millions
 3 Months Ended
Aug. 31, 2023
Aug. 31, 2022
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance $ (55.8)  
Other comprehensive income (loss) before reclassifications 1.8 $ (9.6)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax (0.3) (0.1)
Amortization of prior service (credit) cost (net of tax of $0.1) (0.1) (0.1)
Other comprehensive income (loss) 2.0 (9.6)
Ending balance (53.8) (55.0)
Amortization of prior service credit, tax 0.1 0.1
Reclassification adjustment from AOCI, tax 0.0 0.0
Accumulated Other Comprehensive Income (Loss)    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (55.8) (45.4)
Ending balance (53.8) (55.0)
Foreign currency translation adjustments    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (50.0) (44.6)
Other comprehensive income (loss) before reclassifications 1.8 (9.6)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax 0.0 0.0
Amortization of prior service (credit) cost (net of tax of $0.1) 0.0 0.0
Other comprehensive income (loss) 1.8 (9.6)
Ending balance (48.2) (54.2)
Retirement benefit plans    
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]    
Beginning balance (5.8) (0.8)
Other comprehensive income (loss) before reclassifications 0.0 0.0
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, after Tax (0.3) (0.1)
Amortization of prior service (credit) cost (net of tax of $0.1) (0.1) (0.1)
Other comprehensive income (loss) 0.2 0.0
Ending balance $ (5.6) $ (0.8)