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v3.19.3.a.u2

Property, Plant, and Equipment - Plant Retirements (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Plant To Be Retired |  |
Net book value of plant classified as a regulatory asset | $ 3,527.6 | $ 3,855.8
Deferred tax liabilities | 3,609.0 | 3,436.9
Pleasant Prairie power plant |  |
Plant To Be Retired |  |
Net book value of plant, representing book value less cost of removal and accumulated depreciation | 615.1 |
Previously deferred unprotected tax benefit | 20.6 |
Net book value of plant classified as a regulatory asset | 594.5 |
Deferred tax liabilities | 172.1 |
Pleasant Prairie power plant's book value to be securitized | 100.0 |
Presque Isle power plant |  |
Plant To Be Retired |  |
Net book value of plant, representing book value less cost of removal and accumulated depreciation | 162.7 |
Previously deferred unprotected tax benefit | 6.4 |
Net book value of plant classified as a regulatory asset | 156.3 |
Deferred tax liabilities | 46.5 |
Pulliam power plant |  |
Plant To Be Retired |  |
Net book value of plant classified as a regulatory asset | 36.3 |
Wisconsin |  |
Restructuring Reserve [Roll Forward] |  |
Severance liability, balance at beginning of period | 15.7 | 29.4
Severance payments | (7.2) | (10.7)
Other | (6.4) | (3.0)
Severance liability, balance at end of period | 2.1 | $ 15.7
Edgewater Unit 4 |  |
Plant To Be Retired |  |
Net book value of plant classified as a regulatory asset | $ 5.3 |

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