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Exit Activities (Narrative) (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 27 Months Ended
--- | --- | --- | --- | ---
Jul. 31, 2024 | Apr. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024
Appliance Service Plan Business |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of ASP business |  | $ 124.0 |  |  |  | $ 124.0 | $ 0.0 |
Gain on disposition of assets |  | $ 110.0 |  |  |  |  |  |
Gain sharing with customers, percentage of gain |  |  | 50.00% |  |  |  |  |
Sharing period of gains |  |  | 5 years |  |  |  |  |
Gain on sale utilized as offset | $ 27.5 |  |  |  |  |  |  |
Amount credited to customers | $ 82.5 |  |  |  |  |  |  |
Amount credited to customers, term | 3 years |  |  |  |  |  |  |
Regulatory liability |  |  |  | $ 110.0 |  | 110.0 |  | $ 110.0
Retention Benefits |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Cost deferred |  |  |  | $ 3.0 | $ 4.0 | $ 6.0 | $ 14.0 |
Retention Benefits | D.E. Karn Generating Complex and J.H. Campbell Generating Units | Retention Incentive Program |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Regulatory asset collection period |  |  |  | 3 years |  | 3 years |  | 3 years
Retention Benefits | J.H. Campbell Generating Units |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Expected cost |  |  |  | $ 50.0 |  | $ 50.0 |  | $ 50.0
Retention Benefits | J.H. Campbell Generating Units | Retention Incentive Program |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Cost deferred |  |  |  |  |  |  |  | $ 41.0

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