Summary of Significant Accounting Policies Summary of Significant Accounting Policies Other (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Compensation Arrangements [Line Items]
Equity-based compensation expense	$ 5.8	$ 5.8	$ 5.0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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