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Summary of Significant Accounting Policies Unrecognized Tax Benefits (Details) $ in Millions | Dec. 31, 2017 USD ($)
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Income Tax Contingency [Line Items] |
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 15.8

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- Definition The total amount of unrecognized tax benefits that, if recognized, would affect the effective tax rate. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 + Details
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