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Summary of Significant Accounting Policies - Recent Accounting Pronouncement (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets | $ 17.7
Cumulative Effect on Retained Earnings, Net of Tax | 13.7
Right Of Use Asset [Domain] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | 47.0
Lease Liability [Domain] |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 48.3

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