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Retirement Benefits - Estimated Future Benefit Payments (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 $ 53.0
2025 53.3
2026 53.2
2027 52.6
2028 52.1
2029-2033 251.2
Other Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2024 1.7
2025 1.6
2026 1.5
2027 1.4
2028 1.3
2029-2033 $ 5.5