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Debt - Term Loan B Facility (Details) - USD ($) |  | 9 Months Ended
--- | --- | ---
Jan. 11, 2019 | Sep. 30, 2019 | Sep. 30, 2018
Debt Instrument [Line Items] |  |  |
Proceeds from borrowings |  | $ 470,505,000 | $ 106,500,000
Term Loan | Term Loan B Facility |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, face amount | $ 250,000,000.0 |  |
Proceeds from borrowings | 228,900,000 |  |
Periodic payment, principal | $ 3,100,000 |  |
Term Loan | Term Loan B Facility | London Interbank Offered Rate (LIBOR) |  |  |
Debt Instrument [Line Items] |  |  |
Margin on LIBOR rate | 6.75% |  |
Term Loan | Term Loan B Facility | Base Rate |  |  |
Debt Instrument [Line Items] |  |  |
Margin on LIBOR rate | 5.75% |  |

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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585 + Details
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