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Summary of Significant Accounting Policies New Accounting Pronouncements (Details) $ in Millions | Dec. 31, 2017 USD ($)
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Accounting Standards Update 2014-09 [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Cumulative effect of new accounting principle in period of adoption | $ 10.9
Accounting Standards Update 2016-16 [Member] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
Cumulative effect of new accounting principle in period of adoption | $ 0.9

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