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Leases - Finance and Operating Lease Right of Use Assets and Obligations (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Leases |  |
Operating lease right of use assets | $ 32.0 | $ 15.7
Finance lease right of use assets | 133.8 | 175.3
Current operating lease liabilities | 4.7 | 4.0
Long-term operating lease liabilities | 38.8 | 25.4
Current finance lease liabilities | 0.0 |
Long-term finance lease liabilities | 145.9 | 110.5
Accumulated amortization | $ 6.1 | $ 146.3
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 $11,073.1 and $10,383.8, respectively | Property, plant, and equipment, net of accumulated depreciation and amortization of $11,073.1 and $10,383.8, 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] | Current portion of long-term debt (December 31, 2023 and December 31, 2022 include $9.0 and $8.9, respectively, related to WEPCo Environmental Trust) | Current portion of long-term debt (December 31, 2023 and December 31, 2022 include $9.0 and $8.9, respectively, related to WEPCo Environmental Trust)
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Long-term debt (December 31, 2023 and December 31, 2022 include $85.3 and $94.1, respectively, related to WEPCo Environmental Trust) | Long-term debt (December 31, 2023 and December 31, 2022 include $85.3 and $94.1, respectively, related to WEPCo Environmental Trust)
Power purchase commitment |  |
Leases |  |
Finance lease right of use assets | $ 0.0 | $ 71.8
Current finance lease liabilities | 0.0 | 72.7
Land lease - utility solar generation |  |
Leases |  |
Finance lease right of use assets | 132.7 | 102.4
Current finance lease liabilities | 0.0 |
Long-term finance lease liabilities | 144.8 | 109.3
Other |  |
Leases |  |
Finance lease right of use assets | 1.1 | 1.1
Current finance lease liabilities | 0.0 |
Long-term finance lease liabilities | $ 1.1 | $ 1.2

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