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Income Taxes - Components of deferred tax assets and liabilities (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Components of deferred income taxes classified as net current assets and net long-term liabilities [Abstract] |  |  |  |  |
Statutory federal income tax | 21.00% |  | 21.00% | 21.00% | 35.00%
Estimated tax benefit related to the remeasurement of deferred income taxes from tax legislation |  | $ 2,657.0 |  |  |
Net impact of tax cuts and jobs act of 2017 |  |  |  |  | $ 206.7
Non-current |  |  |  |  |
Tax gross up - regulatory items |  |  | $ 519.8 | $ 579.2 |
Deferred revenues |  |  | 106.3 | 129.3 |
Future tax benefits |  |  | 101.0 | 70.6 |
Other |  |  | 159.8 | 194.4 |
Total deferred tax assets |  |  | 886.9 | 973.5 |
Valuation allowance |  |  | (2.3) | (11.4) |
Net deferred tax assets |  |  | 884.6 | 962.1 |
Non-current |  |  |  |  |
Property-related |  |  | 3,609.0 | 3,436.9 |
Investment in affiliates |  |  | 531.7 | 420.6 |
Deferred costs - Plant retirements |  |  | 232.0 | 176.0 |
Employee benefits and compensation |  |  | 131.4 | 121.2 |
Other |  |  | 149.8 | 195.5 |
Total deferred tax liabilities |  |  | 4,653.9 | 4,350.2 |
Deferred tax liability, net |  |  | $ 3,769.3 | $ 3,388.1 |

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