Retirement Plans and Postretirement Benefit Plans - Summary of Gross Benefit Payments Registrants Expect to Pay (Details) $ in Millions	Dec. 31, 2023 USD ($)
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