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Retirement Plans (Expected Benefit Payments) (Details)
$ in Millions
May 31, 2020
USD ($)
Defined Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
2021 $ 0.4
2022 0.4
2023 0.4
2024 0.4
2025 0.4
2026-2030 1.7
Postretirement Benefit Plan  
Defined Benefit Plan Disclosure [Line Items]  
2021 1.3
2022 1.3
2023 1.3
2024 1.3
2025 1.3
2026-2030 $ 6.2