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Income Taxes - Significant Components of Income Tax Expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Current: |  |  |
U.S. federal current expense (benefit) | $ 0.0 | $ 0.0 | $ 0.0
State current expense (benefit) | 0.0 | (0.1) | (1.1)
Foreign current expense | 4.0 | 0.1 | 0.8
Total current expense (benefit) | 4.0 | (0.0) | (0.3)
Deferred: |  |  |
U.S. federal deferred benefit | (1.2) | (2.2) | (1.6)
State deferred benefit | 0.0 | (0.2) | 0.0
Foreign deferred tax expense (benefit) | (5.9) | (6.0) | 1.7
Total deferred expense (benefit) | (7.1) | (8.4) | 0.1
Total income tax expense (benefit) | $ (3.1) | $ (8.4) | $ (0.2)

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