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Debt - Schedule of Long Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	$ 9,006,510	$ 8,797,424
UNAMORTIZED DEFERRED FINANCING COSTS	(90,184)	(94,110)
CARRYING AMOUNT	8,916,326	8,703,314
Long-term debt, gross, current maturities	(363,911)	(193,759)
Long term debt, gross, net of current portion	8,642,599	8,603,665
Unamortized debt issuance expense, net of current portion	0	0
Unamortized debt issuance expense, net	(90,184)	(94,110)
Carrying amount, current maturities	(363,911)	(193,759)
Carrying amount, excluding current maturities	8,552,415	8,509,555
Australian Dollar Term Loan (the AUD Term Loan)
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	238,433	243,152
UNAMORTIZED DEFERRED FINANCING COSTS	(1,374)	(1,624)
CARRYING AMOUNT	237,059	241,528
FAIR VALUE	239,162	244,014
Real Estate Mortgages, Financing Lease Liabilities and Other
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	492,256	511,922
UNAMORTIZED DEFERRED FINANCING COSTS	(1,003)	(1,086)
CARRYING AMOUNT	491,253	510,836
FAIR VALUE	492,256	511,922
Accounts Receivable Securitization Program
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	257,000	85,000
UNAMORTIZED DEFERRED FINANCING COSTS	(135)	(152)
CARRYING AMOUNT	256,865	84,848
FAIR VALUE	257,000	$ 85,000
Credit Agreement
Debt Instrument [Line Items]
Letters of credit outstanding	38,160
Revolving Credit Facility | Credit Agreement
Debt Instrument [Line Items]
Letters of credit outstanding	3,219
Remaining capacity	1,686,781
Weighted average interest rate		1.90%	1.90%
New Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	60,000	$ 0
UNAMORTIZED DEFERRED FINANCING COSTS	(7,758)	(8,620)
CARRYING AMOUNT	52,242	(8,620)
FAIR VALUE	60,000	0
Term Loan A | Term Loan Facility
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	212,500	215,625
UNAMORTIZED DEFERRED FINANCING COSTS	0	0
CARRYING AMOUNT	212,500	215,625
FAIR VALUE	212,500	215,625
Term Loan B | Term Loan Facility
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	677,927	679,621
UNAMORTIZED DEFERRED FINANCING COSTS	(5,932)	(6,244)
CARRYING AMOUNT	671,995	673,377
FAIR VALUE	679,000	680,750
UK Bilateral Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	192,732	191,101
UNAMORTIZED DEFERRED FINANCING COSTS	(1,147)	(1,307)
CARRYING AMOUNT	191,585	189,794
FAIR VALUE	$ 192,732	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)	$ 550,662	546,003
UNAMORTIZED DEFERRED FINANCING COSTS	(4,765)	(4,983)
CARRYING AMOUNT	545,897	541,020
FAIR VALUE	$ 556,180	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	(9,243)	(9,598)
CARRYING AMOUNT	990,757	990,402
FAIR VALUE	$ 1,025,000	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	(8,266)	(8,561)
CARRYING AMOUNT	816,734	816,439
FAIR VALUE	$ 856,969	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	(5,306)	(5,486)
CARRYING AMOUNT	494,694	494,514
FAIR VALUE	$ 511,250	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	(12,296)	(12,658)
CARRYING AMOUNT	987,704	987,342
FAIR VALUE	$ 1,011,250	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	(14,040)	(14,416)
CARRYING AMOUNT	1,285,960	1,285,584
FAIR VALUE	$ 1,335,750	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	(12,337)	(12,648)
CARRYING AMOUNT	1,087,663	1,087,352
FAIR VALUE	$ 1,080,750	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	(6,582)	(6,727)
CARRYING AMOUNT	593,418	593,273
FAIR VALUE	$ 625,500	$ 660,000

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