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Income Taxes (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 4 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 05, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Mar. 31, 2020 | Dec. 31, 2019
OTA Deferred Tax Liability: |  |  |  |  |  |  |  |  |
Common units issued in connection with settlement of Liquidity Option (in units) |  |  |  |  |  | 54,807,352 |  |  |
Liquidity Option liability |  | $ 511.9 |  |  |  |  |  |  |
Current portion of income tax provision (benefit): |  |  |  |  |  |  |  |  |
Federal |  |  | $ 2.2 | $ (0.4) |  | $ 2.3 | $ 0.5 |  |
State |  |  | 4.1 | 7.5 |  | 8.7 | 16.5 |  |
Foreign |  |  | 0.0 | 0.2 |  | 0.2 | 0.8 |  |
Total current portion |  |  | 6.3 | 7.3 |  | 11.2 | 17.8 |  |
Deferred portion of income tax provision (benefit): |  |  |  |  |  |  |  |  |
Federal |  | 67.8 | 46.4 | 0.0 |  | (126.4) | (0.1) |  |
State |  | 4.4 | 7.0 | 2.6 |  | (4.3) | 4.5 |  |
Foreign |  |  | 0.0 | (0.2) |  | 0.0 | (0.2) |  |
Total deferred portion |  |  | 53.4 | 2.4 |  | (130.7) | 4.2 |  |
Total provision for (benefit from) income taxes |  |  | 59.7 | 9.7 |  | (119.5) | 22.0 |  |
Reconciliation of the provision for (benefit from) income taxes [Abstract] |  |  |  |  |  |  |  |  |
Pre-Tax Net Book Income ("NBI") |  |  | 1,120.5 | 1,246.2 |  | 2,316.3 | 2,538.9 |  |
Texas Margin Tax | [1] |  | 7.0 | 10.1 |  | 14.7 | 21.0 |  |
State income tax provision (benefit), net of federal benefit | [2] |  | 3.2 | 0.1 |  | (8.1) | 0.3 |  |
Federal income tax provision (benefit) computed by applying the federal statutory rate to NBI of corporate entities |  |  | 49.5 | (0.5) |  | (58.3) | 0.7 |  |
Federal benefit attributable to settlement of Liquidity Option | [2] |  | 0.0 | 0.0 |  | (67.8) | 0.0 |  |
Total provision for (benefit from) income taxes |  |  | $ 59.7 | $ 9.7 |  | $ (119.5) | $ 22.0 |  |
Effective income tax rate |  |  | 5.30% | 0.80% |  | (5.20%) | 0.90% |  |
Deferred tax liabilities: |  |  |  |  |  |  |  |  |
Attributable to investment in OTA |  |  | $ 375.2 |  | $ 375.2 | $ 375.2 |  |  |
Attributable to property, plant and equipment |  |  | 105.6 |  | 105.6 | 105.6 |  |  | $ 100.2
Attributable to investments in other entities |  |  | 3.4 |  | 3.4 | 3.4 |  |  | 3.3
Total deferred tax liabilities |  |  | 484.2 |  | 484.2 | 484.2 |  |  | 103.5
Less: Deferred tax assets: |  |  |  |  |  |  |  |  |
Net operating loss carryovers | [3] |  | 0.1 |  | 0.1 | 0.1 |  |  | 0.1
Temporary differences related to Texas Margin Tax |  |  | 2.5 |  | 2.5 | 2.5 |  |  | 3.0
Total deferred tax assets |  |  | 2.6 |  | 2.6 | 2.6 |  |  | 3.1
Total net deferred tax liabilities |  |  | 481.6 |  | 481.6 | 481.6 |  |  | $ 100.4
Oiltanking Holding Americas, Inc. [Member] |  |  |  |  |  |  |  |  |
OTA Deferred Tax Liability: |  |  |  |  |  |  |  |  |
Change in fair value of common units during period | [4] |  |  |  | $ (301.4) |  |  |  |
Blended federal and state tax rate |  |  |  |  | 22.40% |  |  |  |
Change in deferred tax liability due to change in fair value of common units |  |  |  |  | $ (67.4) |  |  |  |
Other, including interim allocations of taxable income |  |  |  |  | 2.9 |  |  |  |
Deferred portion of income tax provision (benefit): |  |  |  |  |  |  |  |  |
Total provision for (benefit from) income taxes |  | (72.2) | 50.5 |  | (64.5) | (136.7) |  |  |
Reconciliation of the provision for (benefit from) income taxes [Abstract] |  |  |  |  |  |  |  |  |
Total provision for (benefit from) income taxes |  | (72.2) | 50.5 |  | (64.5) | (136.7) |  |  |
Deferred tax liabilities: |  |  |  |  |  |  |  |  |
Total deferred tax liabilities |  | $ 439.7 | $ 375.2 |  | $ 375.2 | $ 375.2 |  |  |
Enterprise Products Partners L.P. [Member] |  |  |  |  |  |  |  |  |
OTA Deferred Tax Liability: |  |  |  |  |  |  |  |  |
Closing price (in dollars per unit) |  | $ 23.67 | $ 18.17 |  | $ 18.17 | $ 18.17 |  | $ 14.30 |
[1] | Although the Texas Margin Tax is not considered a state income tax, it has the characteristics of an income tax since it is determined by applying a tax rate to a base that considers our Texas-sourced revenues and expenses.
[2] | The total benefit recognized in income tax expense on March 5, 2020 from settlement of the Liquidity Option was $72.2 million, which is comprised of $4.4 million of state income tax benefit and $67.8 million of federal income tax benefit.
[3] | These losses expire in various years between 2020 and 2037 and are subject to limitations on their utilization.
[4] | The market price of EPD common units declined from $23.67 per unit at March 5, 2020 (settlement date of the Liquidity Option) to $18.17 per unit on June 30, 2020.

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