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Leases - Finance and Operating Lease Right of Use Assets and Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Leases |  |
Operating lease right of use assets | $ 32.1 | $ 32.0
Finance lease right of use assets | 281.3 | 133.8
Current operating lease liabilities | 4.3 | 4.7
Long-term operating lease liabilities | 37.5 | 38.8
Current finance lease liabilities | 0.2 |
Long-term finance lease liabilities | 303.3 | 145.9
Accumulated amortization | $ 10.0 | $ 6.1
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Other | Other
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Property, plant, and equipment, net of accumulated depreciation and amortization of $11,611.9 and $11,073.1, respectively | Property, plant, and equipment, net of accumulated depreciation and amortization of $11,611.9 and $11,073.1, respectively
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other | Other
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other | Other
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other | Other
Land lease - utility solar generation |  |
Leases |  |
Finance lease right of use assets | $ 235.8 | $ 132.7
Current finance lease liabilities | 0.0 |
Long-term finance lease liabilities | 257.9 | 144.8
Land lease - non-utility energy infrastructure solar generation |  |
Leases |  |
Finance lease right of use assets | 43.5 | 0.0
Current finance lease liabilities | 0.0 |
Long-term finance lease liabilities | 43.8 | 0.0
Other |  |
Leases |  |
Finance lease right of use assets | 2.0 | 1.1
Current finance lease liabilities | 0.2 | 0.0
Long-term finance lease liabilities | $ 1.6 | $ 1.1

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479041/842-20-45-1 + Details
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