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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Document Fiscal Year Focus | 2018 |  |
Current: |  |  |
U.S. Federal | $ (25.0) | $ 28.9 | $ 0.0
State and local | 0.1 | 0.1 | 0.1
Foreign | 11.6 | 11.7 | 6.8
Total current tax expense | (13.3) | 40.7 | 6.9
Deferred: |  |  |
U.S. Federal | 7.8 | (26.8) | 0.8
State and local | 0.2 | 0.0 | 0.2
Foreign | 0.8 | (1.0) | 0.4
Total deferred tax (benefit) expense | 8.8 | (27.8) | 1.4
Total income tax expense | $ (4.5) | $ 12.9 | $ 8.3

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