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Supplemental Guarantor Condensed Consolidated Financial Statements - Additional Information (Narrative) (Details) - USD ($) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Jun. 23, 2017
Condensed Consolidated financial statements [Line Items] |  |
Interest owned by the holding company | 100.00% |
Secured Debt [Member] | 6.75% Senior Secured Notes [Member] |  |
Condensed Consolidated financial statements [Line Items] |  |
Debt Instrument, Face Amount |  | $ 200.0

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- Definition [Line Items] for Condensed Consolidated financial statements [Table] + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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