Debt - Schedule of Long Term Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	$ 8,953,538	$ 8,797,424
UNAMORTIZED DEFERRED FINANCING COSTS	(86,536)	(94,110)
CARRYING AMOUNT	8,867,002	8,703,314
Long-term debt, gross, current maturities	(106,274)	(193,759)
Long term debt, gross, net of current portion	8,847,264	8,603,665
Unamortized debt issuance expense, net of current portion	0	0
Unamortized debt issuance expense, net	(86,536)	(94,110)
Carrying amount, current maturities	(106,274)	(193,759)
Carrying amount, excluding current maturities	8,760,728	8,509,555
Australian Dollar Term Loan (the AUD Term Loan)
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	233,754	243,152
UNAMORTIZED DEFERRED FINANCING COSTS	(1,130)	(1,624)
CARRYING AMOUNT	232,624	241,528
FAIR VALUE	234,353	244,014
Real Estate Mortgages, Financing Lease Liabilities and Other
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	485,244	511,922
UNAMORTIZED DEFERRED FINANCING COSTS	(954)	(1,086)
CARRYING AMOUNT	484,290	510,836
FAIR VALUE	485,244	511,922
Accounts Receivable Securitization Program
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	276,800	85,000
UNAMORTIZED DEFERRED FINANCING COSTS	(512)	(152)
CARRYING AMOUNT	276,288	84,848
FAIR VALUE	276,800	$ 85,000
Credit Agreement
Debt Instrument [Line Items]
Letters of credit outstanding	36,679
Revolving Credit Facility \| Credit Agreement
Debt Instrument [Line Items]
Letters of credit outstanding	3,238
Remaining capacity	1,746,762
Weighted average interest rate		1.90%	1.90%
New Credit Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	0	$ 0
UNAMORTIZED DEFERRED FINANCING COSTS	(6,896)	(8,620)
CARRYING AMOUNT	(6,896)	(8,620)
FAIR VALUE	0	0
Term Loan A \| Term Loan Facility
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	209,375	215,625
UNAMORTIZED DEFERRED FINANCING COSTS	0	0
CARRYING AMOUNT	209,375	215,625
FAIR VALUE	209,375	215,625
Term Loan B \| Term Loan Facility
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	676,234	679,621
UNAMORTIZED DEFERRED FINANCING COSTS	(5,620)	(6,244)
CARRYING AMOUNT	670,614	673,377
FAIR VALUE	677,250	680,750
UK Bilateral Revolving Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	193,701	191,101
UNAMORTIZED DEFERRED FINANCING COSTS	(939)	(1,307)
CARRYING AMOUNT	192,762	189,794
FAIR VALUE	$ 193,701	191,101
GBP Senior Notes due 2025 3.875 Percent \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	3.875%
DEBT (INCLUSIVE OF DISCOUNT)	$ 553,430	546,003
UNAMORTIZED DEFERRED FINANCING COSTS	(4,441)	(4,983)
CARRYING AMOUNT	548,989	541,020
FAIR VALUE	$ 559,656	553,101
Senior Notes 4.875 Percent due 2027 \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	4.875%
DEBT (INCLUSIVE OF DISCOUNT)	$ 1,000,000	1,000,000
UNAMORTIZED DEFERRED FINANCING COSTS	(8,887)	(9,598)
CARRYING AMOUNT	991,113	990,402
FAIR VALUE	$ 1,036,250	1,046,250
Senior Notes 5.25 Percent due 2028 \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	5.25%
DEBT (INCLUSIVE OF DISCOUNT)	$ 825,000	825,000
UNAMORTIZED DEFERRED FINANCING COSTS	(7,971)	(8,561)
CARRYING AMOUNT	817,029	816,439
FAIR VALUE	$ 862,125	868,313
Senior Notes 5 Percent Due 2028 Member \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	5.00%
DEBT (INCLUSIVE OF DISCOUNT)	$ 500,000	500,000
UNAMORTIZED DEFERRED FINANCING COSTS	(5,125)	(5,486)
CARRYING AMOUNT	494,875	494,514
FAIR VALUE	$ 518,750	523,125
Senior Notes 4.875 Percent due 2029 \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	4.875%
DEBT (INCLUSIVE OF DISCOUNT)	$ 1,000,000	1,000,000
UNAMORTIZED DEFERRED FINANCING COSTS	(11,934)	(12,658)
CARRYING AMOUNT	988,066	987,342
FAIR VALUE	$ 1,033,750	1,050,000
Senior Notes 5.25 Percent Due 2030 \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	5.25%
DEBT (INCLUSIVE OF DISCOUNT)	$ 1,300,000	1,300,000
UNAMORTIZED DEFERRED FINANCING COSTS	(13,664)	(14,416)
CARRYING AMOUNT	1,286,336	1,285,584
FAIR VALUE	$ 1,373,125	1,400,750
Senior Notes 4.5 Percent Due 2031 \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	4.50%
DEBT (INCLUSIVE OF DISCOUNT)	$ 1,100,000	1,100,000
UNAMORTIZED DEFERRED FINANCING COSTS	(12,026)	(12,648)
CARRYING AMOUNT	1,087,974	1,087,352
FAIR VALUE	$ 1,112,375	1,138,500
Senior Notes 5.625 Percent Due 2032 \| Senior Notes
Debt Instrument [Line Items]
Stated interest rate (as a percent)	5.625%
DEBT (INCLUSIVE OF DISCOUNT)	$ 600,000	600,000
UNAMORTIZED DEFERRED FINANCING COSTS	(6,437)	(6,727)
CARRYING AMOUNT	593,563	593,273
FAIR VALUE	$ 645,000	$ 660,000

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Contractual interest rate for funds borrowed, under the debt agreement.

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