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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, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Non-current |  |  |  |  |
Tax gross up - regulatory items |  | $ 585.8 | $ 579.2 | $ 585.8 |
Deferred revenues |  | 128.8 | 129.3 | 128.8 |
Future tax benefits |  | 303.9 | 70.6 | 303.9 |
Employee benefits and compensation |  | 164.2 | 0.0 | 164.2 |
Property-related |  | 24.4 | 0.0 | 24.4 |
Other |  | 185.0 | 194.4 | 185.0 |
Total deferred tax assets |  | 1,392.1 | 973.5 | 1,392.1 |
Valuation allowance |  | (15.7) | (11.4) | (15.7) |
Net deferred tax assets |  | 1,376.4 | 962.1 | 1,376.4 |
Non-current |  |  |  |  |
Property-related |  | 3,464.6 | 3,436.9 | 3,464.6 |
Investment in transmission affiliate |  | 321.2 | 420.6 | 321.2 |
Deferred costs - Pleasant Prairie |  | 0.0 | 176.0 | 0.0 |
Employee benefits and compensation |  | 285.8 | 121.2 | 285.8 |
Deferred transmission costs |  | 60.1 | 55.4 | 60.1 |
Other |  | 244.5 | 140.1 | 244.5 |
Total deferred tax liabilities |  | 4,376.2 | 4,350.2 | 4,376.2 |
Deferred tax liability, net |  | 2,999.8 | $ 3,388.1 | 2,999.8 |
Net impact of tax cuts and jobs act of 2017 |  |  |  | $ 206.7 |
Expected tax at statutory federal tax rates | 21.00% |  | 21.00% | 35.00% | 35.00%
Estimated tax benefit related to the remeasurement of deferred taxes from tax legislation |  | $ 2,657.0 |  |  |

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