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Income Taxes - Operating Loss and Tax Credit Carryforwards (Details) - USD ($) $ in Millions | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Operating Loss Carryforwards [Line Items] |  |
Charitable contribution carryover (CCCs) | $ 23.7 | $ 8.4
US State |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating losses | 128.8 | 145.3
Tax credit carryforwards | 5.5 | 1.6
US Federal |  |
Operating Loss Carryforwards [Line Items] |  |
Tax credit carryforwards | 7.8 | 7.8
Foreign |  |
Operating Loss Carryforwards [Line Items] |  |
Net operating losses | $ 38.0 | $ 44.2

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