Income Taxes - Summary of Income Tax Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Current tax expense	$ 50.2	$ 93.9	$ 49.2
Deferred income taxes, net	278.5	111.0	182.2
ITCs	(5.8)	(4.6)	(3.5)
Total income tax expense	$ 322.9	$ 200.3	$ 227.9