Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Total operating leases
2023	$ 4.9
2024	4.3
2025	3.8
2026	3.9
2027	4.0
Thereafter	16.6
Total minimum lease payments	37.5
Less: interest	(8.1)
Present value of minimum lease payments	29.4
Less: short-term lease liabilities	(4.0)	$ (3.7)
Long-term operating lease liabilities	25.4	29.1
Finance leases
2023	76.3
2024	4.0
2025	4.1
2026	4.1
2027	4.2
Thereafter	306.8
Total minimum lease payments	399.5
Less: interest	(216.3)
Present value of minimum lease payments	183.2	129.7
Less: short-term lease liabilities	(72.7)
Long-term finance lease liabilities	110.5	51.3
Power purchase commitment
Finance leases
2023	72.7
2024	0.0
2025	0.0
2026	0.0
2027	0.0
Thereafter	0.0
Total minimum lease payments	72.7
Less: interest	0.0
Present value of minimum lease payments	72.7
Less: short-term lease liabilities	(72.7)	(78.4)
Long-term finance lease liabilities	0.0
Land lease - utility solar generation
Finance leases
2023	3.6
2024	3.9
2025	4.0
2026	4.0
2027	4.1
Thereafter	304.1
Total minimum lease payments	323.7
Less: interest	(214.4)
Present value of minimum lease payments	109.3
Less: short-term lease liabilities	0.0
Long-term finance lease liabilities	109.3	51.0
Other
Finance leases
2023	0.0
2024	0.1
2025	0.1
2026	0.1
2027	0.1
Thereafter	2.7
Total minimum lease payments	3.1
Less: interest	(1.9)
Present value of minimum lease payments	1.2
Less: short-term lease liabilities	0.0
Long-term finance lease liabilities	$ 1.2	$ 0.3