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Other Postretirement Benefit Plans - Future Benefit Payments (Details) - Accrued postretirement liability
$ in Millions
Dec. 31, 2021
USD ($)
Future pension benefit payments  
2022 $ 5.0
2023 4.0
2024 4.0
2025 4.0
2026 4.0
2027-2031 $ 17.0