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Income Taxes (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Mar. 05, 2020 | Mar. 31, 2020 | Mar. 31, 2020 | Mar. 31, 2019 | 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 |  |  |  | $ 0.1 | $ 0.9 |
State |  |  |  | 4.6 | 9.0 |
Foreign |  |  |  | 0.2 | 0.6 |
Total current portion |  |  |  | 4.9 | 10.5 |
Deferred portion of income tax provision (benefit): |  |  |  |  |  |
Federal |  | 67.8 |  | (172.8) | (0.1) |
State |  | 4.4 |  | (11.3) | 1.9 |
Total deferred portion |  |  |  | (184.1) | 1.8 |
Total provision for (benefit from) income taxes |  |  |  | (179.2) | 12.3 |
Reconciliation of the provision for (benefit from) income taxes [Abstract] |  |  |  |  |  |
Pre-Tax Net Book Income ("NBI") |  |  |  | 1,195.8 | 1,292.7 |
Texas Margin Tax | [1] |  |  | 7.7 | 10.9 |
State income taxes (net of federal benefit) | [2] |  |  | (11.3) | 0.2 |
Federal income taxes computed by applying the federal statutory rate to NBI of corporate entities |  |  |  | (107.8) | 1.2 |
Federal expense (benefit) attributable to settlement of option exercise | [2] |  |  | (67.8) | 0.0 |
Total provision for (benefit from) income taxes |  |  |  | $ (179.2) | $ 12.3 |
Effective income tax rate |  |  |  | (15.00%) | 1.00% |
Deferred tax liabilities: |  |  |  |  |  |
Deferred Tax Liabilities, Unrealized Gains on Trading Securities |  |  | $ 324.7 | $ 324.7 |  |
Attributable to property, plant and equipment |  |  | 103.2 | 103.2 |  | $ 100.2
Attributable to investments in other entities |  |  | 3.3 | 3.3 |  | 3.3
Total deferred tax liabilities |  |  | 431.2 | 431.2 |  | 103.5
Less: Deferred tax assets: |  |  |  |  |  |
Net operating loss carryovers | [3] |  | 0.1 | 0.1 |  | 0.1
Temporary differences related to Texas Margin Tax |  |  | 2.9 | 2.9 |  | 3.0
Total deferred tax assets |  |  | 3.0 | 3.0 |  | 3.1
Total net deferred tax liabilities |  |  | 428.2 | 428.2 |  | $ 100.4
Oiltanking Holding Americas, Inc. [Member] |  |  |  |  |  |
OTA Deferred Tax Liability: |  |  |  |  |  |
Change in fair value of common units during period | [4] |  | $ (513.5) |  |  |
Blended federal and state tax rate |  |  | 22.40% |  |  |
Change in deferred tax liability due to change in fair value of common units |  |  | $ (114.8) |  |  |
Other, including interim allocations of taxable income |  |  | (0.2) |  |  |
Deferred portion of income tax provision (benefit): |  |  |  |  |  |
Total provision for (benefit from) income taxes |  | (72.2) | (115.0) | (187.2) |  |
Reconciliation of the provision for (benefit from) income taxes [Abstract] |  |  |  |  |  |
Total provision for (benefit from) income taxes |  | (72.2) | (115.0) | (187.2) |  |
Deferred tax liabilities: |  |  |  |  |  |
Total deferred tax liabilities |  | $ 439.7 | $ 324.7 | $ 324.7 |  |
Enterprise Products Partners L.P. [Member] |  |  |  |  |  |
OTA Deferred Tax Liability: |  |  |  |  |  |
Closing price (in dollars per unit) |  | $ 23.67 | $ 14.30 | $ 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 $14.30 per unit on March 31, 2020.

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