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Income Taxes - Operating Loss and Tax Credit Carryforwards (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
Charitable contribution carryover (CCCs) | $ 39.6 | $ 18.0
Interest limitation carryover (ILC) | 10.6 | 0.0
US State |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating losses | 355.7 | 133.9
Tax credit carryforwards | 8.0 | 8.1
US Federal |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforwards | 12.2 | 12.2
Foreign |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating losses | $ 57.0 | $ 33.1

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