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Long-Term Debt - Term Loans (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Jun. 30, 2018 | Dec. 31, 2018
Term Loan A |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, annual principal payment | $ 100,000,000 |  | $ 100,000,000
Term Loan B |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, annual principal payment | 35,000,000 |  | $ 35,000,000
Term Loan B | London Interbank Offered Rate (LIBOR) | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, variable interest rate margin |  |  | 0.75%
Term Loan A-2 |  |  |
Debt Instrument [Line Items] |  |  |
Derivative Asset, Notional Amount | 995,000,000 |  | $ 995,000,000
Term Loan Facility | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Maturity date ranges |  |  | 1 month
Term Loan Facility | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Maturity date ranges |  |  | 12 months
Interest rate cap agreements 1 | Term Loan A | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Remaining outstanding debt | $ 517,500,000 |  | $ 517,500,000
Interest rate cap agreements 1 | Term Loan B | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Derivative Asset, Notional Amount |  | $ 3,500,000,000 |
Interest rate cap agreements 1 | Term Loan Facility | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, variable interest rate margin | 3.50% | 3.50% |
Derivative Asset, Notional Amount | $ 3,500,000,000 |  | $ 3,500,000,000

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