Summary of Significant Accounting Policies and Related Data - New Accounting Pronouncements Not Yet Adopted (Details) - Subsequent Event - Accounting Standards Update 2016-02 $ in Millions	Nov. 01, 2019 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right-of-use asset	$ 77.1
Operating lease, liability	$ 76.0