Summary of Significant Accounting Policies - Narrative - Income Taxes (Details)	Dec. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Subsidiaries Filing Stand Alone Federal and State Tax Returns	2
Held for sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of Subsidiaries Filing Stand Alone Federal and State Tax Returns	1

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.

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