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Retirement Benefits Plans (Expected Benefit Payments) (Details) - Postretirement benefit plans
$ in Millions
Dec. 31, 2022
USD ($)
Regulatory Liabilities [Line Items]  
2023 $ 2.4
2024 2.3
2025 2.1
2026 1.9
2027 1.8
2028 through 2032 $ 7.1