Leases - Future Minimum Lease Payments (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Total operating leases
2024	$ 6.4
2025	5.6
2026	5.8
2027	5.7
2028	5.5
Thereafter	71.0
Total minimum lease payments	100.0
Less: interest	(56.5)
Present value of minimum lease payments	43.5
Less: short-term lease liabilities	(4.7)	$ (4.0)
Long-term operating lease liabilities	38.8	25.4
Finance leases
2024	4.8
2025	6.1
2026	6.2
2027	6.3
2028	6.5
Thereafter	468.3
Total minimum lease payments	498.2
Less: interest	(352.3)
Present value of minimum lease payments	145.9	183.2
Less: short-term lease liabilities	0.0
Long-term finance lease liabilities	145.9	110.5
Land lease - utility solar generation
Finance leases
2024	4.7
2025	6.0
2026	6.1
2027	6.2
2028	6.4
Thereafter	465.8
Total minimum lease payments	495.2
Less: interest	(350.4)
Present value of minimum lease payments	144.8
Less: short-term lease liabilities	0.0
Long-term finance lease liabilities	144.8	109.3
Other
Finance leases
2024	0.1
2025	0.1
2026	0.1
2027	0.1
2028	0.1
Thereafter	2.5
Total minimum lease payments	3.0
Less: interest	(1.9)
Present value of minimum lease payments	1.1
Less: short-term lease liabilities	0.0
Long-term finance lease liabilities	$ 1.1	$ 1.2