Retirement Plans and Postretirement Benefit Plans - Schedule of Capitalized Pension and Postretirement Cost (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Capitalized Portion of Net Periodic Benefit Cost	$ 2.2	$ 3.0	$ 3.4
Pension Plan [Member] | Og and E [Member]
Defined Benefit Plan Disclosure [Line Items]
Capitalized Portion of Net Periodic Benefit Cost	1.9	2.5	2.9
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Capitalized Portion of Net Periodic Benefit Cost	0.1	0.2	0.2
Other Postretirement Benefits Plan [Member] | Og and E [Member]
Defined Benefit Plan Disclosure [Line Items]
Capitalized Portion of Net Periodic Benefit Cost	$ 0.1	$ 0.1	$ 0.1