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Description of the Business and Summary of Significant Accounting Policies - New Accounting Guidance (Details) - Scenario, Forecast $ in Millions | Jan. 01, 2019 USD ($)
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Minimum | Lease assets |
Segment Reporting Information [Line Items] |
Estimate of additional assets and liabilities with adoption of ASC 842 | $ 115.0
Minimum | Lease liabilities |
Segment Reporting Information [Line Items] |
Estimate of additional assets and liabilities with adoption of ASC 842 | 115.0
Maximum | Lease assets |
Segment Reporting Information [Line Items] |
Estimate of additional assets and liabilities with adoption of ASC 842 | 145.0
Maximum | Lease liabilities |
Segment Reporting Information [Line Items] |
Estimate of additional assets and liabilities with adoption of ASC 842 | $ 145.0

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