Senior Secured Credit Facility - Level 4 Tag - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2016
Senior Secured Credit Facility
Debt and Lease Obligation	$ 3,629,100,000		$ 3,629,100,000
Letters of Credit Outstanding, Amount	100,000		100,000
Incremental Borrowings, Amount	$ 1,000,000,000.0		$ 1,000,000,000.0
Incremental Borrowings Criteria, Percentage of Consolidated EBITDA	100.00%		100.00%
Incremental Borrowings Criteria, Senior Secured Leverage ratio	4.25		4.25
Net Leverage Ratio Requirement	5.5		5.5
Covenant Dividend Restriction Amount	$ 75,000,000		$ 75,000,000
Covenant Dividend Restriction Percentage of Consolidated EBITDA	7.50%		7.50%
Net Leverage Ratio Requirement, Dividends	4.75		4.75
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	$ 6,200,000	$ 23,500,000	$ 41,800,000	$ 36,400,000
Hedge instruments: Net change on interest rate cap	(4,500,000)	7,100,000	(4,100,000)	11,700,000
2020 3 year Interest Rate Swap [Member]
Senior Secured Credit Facility
Derivative, Notional Amount	$ 1,110,000,000.0		$ 1,110,000,000.0
2020 3 year Interest Rate Swap [Member] | Minimum [Member]
Senior Secured Credit Facility
Derivative, Fixed Interest Rate	0.9125%		0.9125%
2020 3 year Interest Rate Swap [Member] | Maximum [Member]
Senior Secured Credit Facility
Derivative, Fixed Interest Rate	0.928%		0.928%
2020 2 year Interest Rate Swap [Member]
Senior Secured Credit Facility
Derivative, Notional Amount	$ 1,150,000,000.0		$ 1,150,000,000.0
2020 2 year Interest Rate Swap [Member] | Minimum [Member]
Senior Secured Credit Facility
Derivative, Fixed Interest Rate	0.52%		0.52%
2020 2 year Interest Rate Swap [Member] | Maximum [Member]
Senior Secured Credit Facility
Derivative, Fixed Interest Rate	0.5295%		0.5295%
Interest Rate Swap [Member]
Senior Secured Credit Facility
Derivative, Notional Amount	$ 1,420,000,000.0		$ 1,420,000,000.0
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax	9,600,000	18,200,000	44,900,000	28,600,000
Interest Expense, Hedge, gross of tax	(7,900,000)	(600,000)	(11,600,000)	(1,200,000)
Hedge instruments: Net change on interest rate cap	12,800,000	24,300,000	59,700,000	38,100,000
Interest Expense, Hedge, net of tax	$ (6,600,000)	(500,000)	(8,800,000)	(900,000)
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months			$ (40,300,000)
Interest Rate Swap [Member] | Minimum [Member]
Senior Secured Credit Facility
Derivative, Fixed Interest Rate	2.702%		2.702%
Interest Rate Swap [Member] | Maximum [Member]
Senior Secured Credit Facility
Derivative, Fixed Interest Rate	2.706%		2.706%
Interest Rate Cap [Member]
Senior Secured Credit Facility
Derivative, Cap Interest Rate					0.75%
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax		5,300,000		8,800,000
Interest Expense, Hedge, gross of tax	$ (4,600,000)	1,300,000	$ (6,700,000)	3,000,000.0
Hedge instruments: Net change on interest rate cap		7,100,000		11,700,000
Interest Expense, Hedge, net of tax	(3,900,000)	$ 1,000,000.0	(5,100,000)	$ 2,200,000
Net recognized loss into income on Hedge	4,500,000		4,100,000
Net recognized loss into income on Hedge, net of tax	3,400,000		$ 3,100,000
Senior Loans [Member]
Senior Secured Credit Facility
Debt Instrument, Description of Variable Rate Basis			LIBOR
Senior Secured Term Loan B-5 [Member]
Senior Secured Credit Facility
Debt and Lease Obligation	2,496,600,000		$ 2,496,600,000
Debt Instrument, Fair Value Disclosure	2,411,500,000		2,411,500,000
Senior Secured Revolving Line of Credit
Senior Secured Credit Facility
Debt and Lease Obligation	0		0
Line of Credit Facility, Remaining Borrowing Capacity	299,900,000		299,900,000
Senior Secured Term Loan A-3 [Member]
Senior Secured Credit Facility
Debt and Lease Obligation	1,130,900,000		1,130,900,000
Debt Instrument, Fair Value Disclosure	$ 1,118,600,000		$ 1,118,600,000