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Income Taxes - Significant Components of our deferred tax assets & liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Deferred tax assets: |  |
Accrued postretirement benefit cost | $ 30.7 | $ 25.7
Net operating losses | 467.6 | 395.8
Disallowed interest expense | 29.2 | 27.7
Derivative and hedging contracts | 1.2 | 0.0
Fixed asset tax over book basis | 9.2 | 17.0
Other | 28.3 | 26.1
Total deferred tax assets | 566.2 | 492.3
Valuation allowance | (537.6) | (487.9)
Net deferred tax assets | 28.6 | 4.4
Deferred tax liabilities: |  |
Fixed asset book over tax basis | (62.0) | (60.5)
Derivatives | 0.0 | (19.0)
Foreign basis differences | (18.1) | (19.8)
Other | (20.6) | (7.9)
Total deferred tax liabilities | (100.7) | (107.2)
Net deferred tax liability | $ (72.1) | $ (102.8)

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