Debt - Schedule of Long Term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	$ 9,216,038	$ 8,797,424
UNAMORTIZED DEFERRED FINANCING COSTS	(82,621)	(94,110)
CARRYING AMOUNT	9,133,417	8,703,314
Long-term debt, gross, current maturities	(319,025)	(193,759)
Long term debt, gross, net of current portion	8,897,013	8,603,665
Unamortized debt issuance expense, net of current portion	881	0
Unamortized debt issuance expense, net	(81,740)	(94,110)
Carrying amount, current maturities	(318,144)	(193,759)
Carrying amount, excluding current maturities	8,815,273	8,509,555
Australian Dollar Term Loan (the AUD Term Loan)
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	223,109	243,152
UNAMORTIZED DEFERRED FINANCING COSTS	(881)	(1,624)
CARRYING AMOUNT	222,228	241,528
FAIR VALUE	223,557	244,014
Real Estate Mortgages, Financing Lease Liabilities and Other
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	483,934	511,922
UNAMORTIZED DEFERRED FINANCING COSTS	(905)	(1,086)
CARRYING AMOUNT	483,029	510,836
FAIR VALUE	483,934	511,922
Accounts Receivable Securitization Program
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	266,400	85,000
UNAMORTIZED DEFERRED FINANCING COSTS	(449)	(152)
CARRYING AMOUNT	265,951	84,848
FAIR VALUE	266,400	$ 85,000
Credit Agreement
Debt Instrument [Line Items]
Letters of credit outstanding	36,506
Revolving Credit Facility \| Credit Agreement
Debt Instrument [Line Items]
Letters of credit outstanding	3,064
Remaining capacity	$ 1,436,936
Weighted average interest rate	1.80%	1.90%
New Credit Agreement \| Revolving Credit Facility
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	$ 310,000	$ 0
UNAMORTIZED DEFERRED FINANCING COSTS	(6,034)	(8,620)
CARRYING AMOUNT	303,966	(8,620)
FAIR VALUE	310,000	0
Term Loan A \| Term Loan Facility
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	206,250	215,625
UNAMORTIZED DEFERRED FINANCING COSTS	0	0
CARRYING AMOUNT	206,250	215,625
FAIR VALUE	206,250	215,625
Term Loan B \| Term Loan Facility
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	674,540	679,621
UNAMORTIZED DEFERRED FINANCING COSTS	(5,308)	(6,244)
CARRYING AMOUNT	669,232	673,377
FAIR VALUE	675,500	680,750
UK Bilateral Revolving Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
DEBT (INCLUSIVE OF DISCOUNT)	188,431	191,101
UNAMORTIZED DEFERRED FINANCING COSTS	(874)	(1,307)
CARRYING AMOUNT	187,557	189,794
FAIR VALUE	$ 188,431	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)	$ 538,374	546,003
UNAMORTIZED DEFERRED FINANCING COSTS	(4,151)	(4,983)
CARRYING AMOUNT	534,223	541,020
FAIR VALUE	$ 544,431	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	(8,532)	(9,598)
CARRYING AMOUNT	991,468	990,402
FAIR VALUE	$ 1,035,000	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	(7,676)	(8,561)
CARRYING AMOUNT	817,324	816,439
FAIR VALUE	$ 861,094	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	(4,944)	(5,486)
CARRYING AMOUNT	495,056	494,514
FAIR VALUE	$ 521,250	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	(11,573)	(12,658)
CARRYING AMOUNT	988,427	987,342
FAIR VALUE	$ 1,047,500	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	(13,287)	(14,416)
CARRYING AMOUNT	1,286,713	1,285,584
FAIR VALUE	$ 1,376,375	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	(11,715)	(12,648)
CARRYING AMOUNT	1,088,285	1,087,352
FAIR VALUE	$ 1,111,000	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	(6,292)	(6,727)
CARRYING AMOUNT	593,708	593,273
FAIR VALUE	$ 642,000	$ 660,000

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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