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Income Taxes, Deferred Tax Liabilities and Assets (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Mar. 05, 2020
--- | --- | --- | ---
Deferred tax liabilities: |  |  |  |
Attributable to investment in OTA |  | $ 384.2 | $ 356.6 | $ 439.7
Attributable to property, plant and equipment |  | 118.0 | 106.4 |
Attributable to investments in other entities |  | 5.2 | 4.1 |
Other |  | 13.5 | 0.0 |
Total deferred tax liabilities |  | 520.9 | 467.1 |
Deferred tax assets: |  |  |  |
Net operating loss carryovers | [1] | 14.3 | 0.1 |
Temporary differences related to Texas Margin Tax |  | 2.8 | 2.3 |
Total deferred tax assets |  | 17.1 | 2.4 |
Valuation allowance |  | 14.2 | 0.0 |
Total deferred tax assets, net of valuation allowance |  | 2.9 | 2.4 |
Total net deferred tax liabilities |  | 518.0 | $ 464.7 |
Net operating loss carryover subject to expiration |  | 0.1 |  |
Net operating loss carryover not subject to expiration |  | $ 14.2 |  |
[1] | Of the loss amount presented as of December 31, 2021, $0.1 million expires in various years between 2022 and 2037. The remaining $14.2 million has an indefinite carryover period. All losses are subject to limitations on their utilization.

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