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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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Deferred Tax Assets, Interest Limitation Carryforwards

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible charitable contribution carryforwards.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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