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Pension and Postretirement Benefits (Estimated Future Benefit Payments) (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 $ 3.6
2025 3.6
2026 3.2
2027 3.5
2028 3.8
2029 to 2033 20.6
Total payments 38.3
Postretirement Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 1.3
2025 1.3
2026 1.1
2027 1.2
2028 1.1
2029 to 2033 4.9
Total payments $ 10.9