Income Taxes - Summary of Tax Credit Carryforwards (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Income Taxes [Line Items]
Tax Credit Carryforward, Deferred Tax Asset	$ 0.0	$ 208.4
State tax credits	(221.2)	(221.2)
Og and E [Member]
Income Taxes [Line Items]
Tax Credit Carryforward, Deferred Tax Asset	0.0	209.8
State tax credits	(208.5)	$ (205.9)
Oklahoma investment tax credits [Member]
Income Taxes [Line Items]
Tax Credit Carryforward, Amount	242.8
State tax credits	191.8
Oklahoma investment tax credits [Member] | Og and E [Member]
Income Taxes [Line Items]
Tax Credit Carryforward, Amount	226.7
State tax credits	179.1
Oklahoma capital investment board credits [Member]
Income Taxes [Line Items]
Tax Credit Carryforward, Amount	12.8
State tax credits	12.8
Oklahoma capital investment board credits [Member] | Og and E [Member]
Income Taxes [Line Items]
Tax Credit Carryforward, Amount	12.8
State tax credits	12.8
Oklahoma zero emission tax credits [Member]
Income Taxes [Line Items]
Tax Credit Carryforward, Amount	22.6
State tax credits	16.6
Oklahoma zero emission tax credits [Member] | Og and E [Member]
Income Taxes [Line Items]
Tax Credit Carryforward, Amount	22.6
State tax credits	$ 16.6