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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.