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Income Taxes - Operating Loss Carryforwards (Details) $ in Millions	Dec. 31, 2017 USD ($)
United States Federal and Non-United States
Income Tax Contingency [Line Items]
2018	$ 1.5
2019	6.5
2020	3.3
2021	5.3
2022	3.4
Thereafter	25.0
No expirations	356.2
Total net operating loss carryforwards	401.2
United States State
Income Tax Contingency [Line Items]
2018	3.0
2019	4.0
2020	0.2
2021	3.8
2022	0.0
Thereafter	187.7
No expirations	0.0
Total net operating loss carryforwards	$ 198.7

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are not subject to expiration dates.

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319

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