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Retirement Plans and Postretirement Benefit Plans - Summary of Gross Benefit Payments Registrants Expect to Pay (Details) $ in Millions | Dec. 31, 2023 USD ($)
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Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Postretirement Plan, Expected Future Benefit Payments, Next Twelve Months | $ 13.9
Postretirement Plan, Expected Future Benefit Payments, Year Two | 11.5
Postretirement Plan, Expected Future Benefit Payments, Year Three | 10.9
Postretirement Plan, Expected Future Benefit Payments in Year Four | 9.9
Postretirement Plan, Expected Future Benefit Payments, Year Five | 9.0
Postretirement Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter | 36.9
Og and E [Member] |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Postretirement Plan, Expected Future Benefit Payments, Next Twelve Months | 10.5
Postretirement Plan, Expected Future Benefit Payments, Year Two | 8.6
Postretirement Plan, Expected Future Benefit Payments, Year Three | 8.0
Postretirement Plan, Expected Future Benefit Payments in Year Four | 7.4
Postretirement Plan, Expected Future Benefit Payments, Year Five | 6.8
Postretirement Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter | $ 27.8

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