Variable Interest Entities - Activity of Alternative Energy Partnership Investments (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Tax benefit recognized from Alternative Energy Partnership	$ (88.3)	$ (124.8)	$ 100.2
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Fundings	0.0	80.0
Cash distribution from investment	3.3	0.5
Loss on investments in Alternative Energy Partnership	(19.9)	(61.2)
Income tax credits recognized	4.3	73.9
Tax benefit recognized from Alternative Energy Partnership	$ 3.7	$ 5.1