Common Equity - Share Repurchase Program (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Stockholders' Equity Note [Abstract]
New shares of common stock issued	0.0	0.0	0.0
Shares purchased	0.7	0.4	1.0
Cost of shares purchased	$ 69.2	$ 33.1	$ 99.2