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Nominal or face amount used to calculate payments on the derivative asset.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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Long-Term Debt - Term Loans (Details) - USD ($)	6 Months Ended		12 Months Ended
Long-Term Debt - Term Loans (Details) - USD ($)	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