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Income Taxes, Reconciliation (Details) - USD ($) $ in Millions |  | 3 Months Ended | 7 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Mar. 05, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Reconciliation of the benefit from (provision for) income taxes [Abstract] |  |  |  |  |  |  |
Pre-Tax Net Book Income ("NBI") |  |  | $ 1,198.2 | $ 1,064.9 |  | $ 3,748.0 | $ 3,381.2
Texas Margin Tax | [1] |  | (9.6) | (7.2) |  | (37.0) | (21.9)
State income tax benefit (provision), net of federal benefit | [2] |  | (0.1) | 1.6 |  | (1.0) | 9.7
Federal income tax benefit (provision) computed by applying the federal statutory rate to NBI of corporate entities |  |  | (3.3) | 25.1 |  | (9.8) | 83.4
Federal benefit attributable to settlement of Liquidity Option Agreement | [2] |  | 0.0 | 0.0 |  | 0.0 | 67.8
Valuation allowance | [3] |  | (3.1) | 0.0 |  | (9.3) | 0.0
Other |  |  | 0.0 | (0.4) |  | (0.2) | (0.4)
Total benefit from (provision for) income taxes |  |  | $ (16.1) | $ 19.1 |  | $ (57.3) | $ 138.6
Effective income tax rate |  |  | (1.30%) | 1.80% |  | (1.50%) | 4.10%
OTA Holdings, Inc. [Member] |  |  |  |  |  |  |
Reconciliation of the benefit from (provision for) income taxes [Abstract] |  |  |  |  |  |  |
Total benefit from (provision for) income taxes |  | $ 72.2 | $ (6.8) | $ 21.3 | $ 85.8 | $ (20.1) | $ 158.0
[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] | Management believes that it is more likely than not that the net deferred tax assets attributable to OTA will not be fully realizable; therefore, we have provided for a valuation allowance.

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- Definition The amount of income tax expense (benefit) for the period computed by applying the Texas margin tax. The tax is assessed on Texas sourced taxable margin which is defined as the lesser of (i) 70% of total revenue or (ii) total revenue less (a) cost of goods sold or (b) compensation and benefits. + References No definition available. + Details
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