Stock-Based Compensation - Fair Value of Vested Performance Units and Restricted Stock (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Performance Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair Value of Vested Performance Units and Restricted Stock	$ 9.0	$ 6.2	$ 8.1
Performance Units [Member] | Og and E [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair Value of Vested Performance Units and Restricted Stock	2.4	1.7	2.3
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair Value of Vested Performance Units and Restricted Stock	2.4	2.1	2.2
Restricted Stock [Member] | Og and E [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair Value of Vested Performance Units and Restricted Stock	$ 0.6	$ 0.5	$ 0.5