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Long-term debt Schedule of Derivative Instruments (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
2019 Interest Rate Cap Agreements Effective June 30, 2020
Derivative [Line Items]
Derivative, effective date			Jun. 30, 2020
Derivative, expiration date			Jun. 30, 2024
2015 Interest Rate Cap Agreements Effective June 29, 2018
Derivative [Line Items]
Derivative, effective date			Jun. 29, 2018
Derivative, expiration date			Jun. 30, 2020
Term Loan Facility | 2019 Interest Rate Cap Agreements Effective June 30, 2020 | Maximum
Derivative [Line Items]
Notional amounts of interest rate agreements	$ 3,500,000,000		$ 3,500,000,000
LIBOR plus interest rate margin			2.00%
Term Loan Facility | 2015 Interest Rate Cap Agreements Effective June 29, 2018 | Maximum
Derivative [Line Items]
Notional amounts of interest rate agreements	3,500,000,000		$ 3,500,000,000
LIBOR plus interest rate margin			3.50%
Cash Flow Hedging
Derivative [Line Items]
Amount of debt expense reclassified from accumulated OCI into income	1,623,000	$ 1,606,000	$ 3,246,000	$ 3,212,000
Amount of unrealized losses in OCI on interest rate cap agreements	(1,824,000)	$ (31,000)	(14,842,000)	$ (611,000)
Debt Expense | Cash Flow Hedging | 2019 Interest Rate Cap Agreements Effective June 30, 2020
Derivative [Line Items]
Amount of debt expense reclassified from accumulated OCI into income			0
Amount of unrealized losses in OCI on interest rate cap agreements			19,777,000
Debt Expense | Cash Flow Hedging | 2015 Interest Rate Cap Agreements Effective June 29, 2018
Derivative [Line Items]
Amount of debt expense reclassified from accumulated OCI into income			4,326,000
Amount of unrealized losses in OCI on interest rate cap agreements			0
Other Long-term Assets | 2019 Interest Rate Cap Agreements Effective June 30, 2020
Derivative [Line Items]
Derivative asset, fair value, gross asset	4,675,000		4,675,000		$ 24,452,000
Other Long-term Assets | 2015 Interest Rate Cap Agreements Effective June 29, 2018
Derivative [Line Items]
Derivative asset, fair value, gross asset	$ 0		$ 0		$ 0

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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

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Fair value, before effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Date the entity entered into the derivative contract, in CCYY-MM-DD format.

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The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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