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Pensions and Postretirement Benefits - Summary Company's Expected Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2021
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2022 $ 6.2
2023 6.4
2024 6.5
2025 6.5
2026 6.6
2027 to 2031 31.8
Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2022 0.7
2023 0.7
2024 0.7
2025 0.6
2026 0.6
2027 to 2031 2.4
Postretirement Benefits | Gross  
Defined Benefit Plan Disclosure [Line Items]  
2022 0.8
2023 0.8
2024 0.8
2025 0.7
2026 0.7
2027 to 2031 2.6
Postretirement Benefits | Expected Medicare Subsidy  
Defined Benefit Plan Disclosure [Line Items]  
2022 0.1
2023 0.1
2024 0.1
2025 0.1
2026 0.1
2027 to 2031 $ 0.2