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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Period of amortization over a future period of time

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Goodwill and Intangibles - Intangible Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets
Amortization	$ 50.6	$ 11.3	$ 7.5
Period of amortization	5 years
Amortization to be recorded as an increase to operating revenues
Amortization to be recorded in the next five years
2024	$ 53.4
2025	53.4
2026	53.4
2027	53.4
2028	53.4
Amortization to be recorded as a decrease to other operation and maintenance
Amortization to be recorded in the next five years
2024	0.2
2025	0.2
2026	0.2
2027	0.2
2028	0.2
WECI
Finite-Lived Intangible Assets
Gross Carrying Amount	665.8	355.8
Accumulated Amortization	(71.0)	(20.4)
Net Carrying Amount	594.8	335.4
PPAs \| WECI
Finite-Lived Intangible Assets
Gross Carrying Amount	653.9	343.9
Accumulated Amortization	(66.6)	(16.9)
Net Carrying Amount	$ 587.3	327.0
PPAs \| Blooming Grove Wind Energy Center LLC, Tatanka Ridge Wind, LLC, and Jayhawk Wind, LLC
Finite-Lived Intangible Assets
Weighted average useful life	11 years
Proxy revenue swap \| WECI
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 7.2	7.2
Accumulated Amortization	(3.5)	(2.8)
Net Carrying Amount	$ 3.7	4.4
Proxy revenue swap \| Upstream Wind Energy LLC
Finite-Lived Intangible Assets
Weighted average useful life	5 years
Length of proxy revenue contract, in years	10 years
Interconnection agreements \| WECI
Finite-Lived Intangible Assets
Gross Carrying Amount	$ 4.7	4.7
Accumulated Amortization	(0.9)	(0.7)
Net Carrying Amount	$ 3.8	$ 4.0
Interconnection agreements \| Tatanka Ridge Wind LLC and Bishop Hill Energy III LLC
Finite-Lived Intangible Assets
Weighted average useful life	17 years