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Property, Plant, and Equipment (Details) $ in Millions | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Oct. 31, 2017 MW | Aug. 31, 2016 MW | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Property, plant, and equipment |  |  |  |
Accumulated depreciation |  |  | $ 8,618.5 | $ 8,214.6
Net property, plant, and equipment |  |  | 21,347.0 | 19,915.5
Severance expense |  |  | 29.4 |
UMERC |  |  |  |
Property, plant, and equipment |  |  |  |
Capacity of natural gas-fired generation facility (in megawatts) | MW | 180 | 180 |  |
Pleasant Prairie power plant |  |  |  |
Property, plant, and equipment |  |  |  |
Plant to be retired, net |  |  | 681.3 |
Presque Isle power plant |  |  |  |
Property, plant, and equipment |  |  |  |
Plant to be retired, net |  |  | 191.4 |
Pulliam power plant |  |  |  |
Property, plant, and equipment |  |  |  |
Plant to be retired, net |  |  | 44.9 |
Edgewater Unit 4 |  |  |  |
Property, plant, and equipment |  |  |  |
Plant to be retired, net |  |  | 13.0 |
Utility operations |  |  |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment |  |  | 23,646.7 | 24,185.1
Accumulated depreciation |  |  | 7,021.8 | 7,609.7
Net |  |  | 16,624.9 | 16,575.4
CWIP |  |  | 508.2 | 320.0
Plant to be retired, net |  |  | 930.6 | 0.0
Net property, plant, and equipment |  |  | 18,063.7 | 16,895.4
Non-utility operations |  |  |  |
Property, plant, and equipment |  |  |  |
Property, plant, and equipment |  |  | 3,797.2 | 3,520.3
Accumulated depreciation |  |  | 671.3 | 604.9
Net |  |  | 3,125.9 | 2,915.4
CWIP |  |  | 157.4 | 104.7
Net property, plant, and equipment |  |  | $ 3,283.3 | $ 3,020.1

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