Debt - Schedule of Long Term Debt (Details) € in Thousands, $ in Thousands, $ in Thousands	1 Months Ended
	Sep. 22, 2019 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2019 EUR (€)	Sep. 30, 2019 AUD ($)	Sep. 30, 2019 CAD ($)	Dec. 31, 2018 USD ($)	Mar. 22, 2018 USD ($)
Debt Instrument [Line Items]
Debt (inclusive of discount)		$ 8,704,642,000				$ 8,229,430,000
Long-term debt, gross, current maturities		(394,822,000)				(126,406,000)
Long term debt, gross, net of current portion		8,309,820,000				8,103,024,000
Unamortized Deferred Financing Costs		(89,473,000)				(86,607,000)
Unamortized debt issuance expense, current		0				0
Unamortized debt issuance expense, net		(89,473,000)				(86,607,000)
Carrying Amount		8,615,169,000				8,142,823,000
Carrying Amount, current maturities		(394,822,000)				(126,406,000)
Carrying Amount, excluding current maturities		8,220,347,000				8,016,417,000
Revolving Credit Facility
Debt Instrument [Line Items]
Letters of credit outstanding		16,843,000
Remaining capacity		1,378,278,000
Australian Dollar Term Loan
Debt Instrument [Line Items]
Debt (inclusive of discount)		219,871,000				233,955,000
Unamortized Deferred Financing Costs		(2,389,000)				(3,084,000)
Carrying Amount		217,482,000		$ 327,500		230,871,000
Fair Value		$ 221,165,000				235,645,000
Average interest rate (as a percent)		4.90%	4.90%	4.90%	4.90%
Debt instrument, unamortized discount		$ 1,294,000				1,690,000
Senior Notes 4.375 Percent due 2021
Debt Instrument [Line Items]
Debt (inclusive of discount)		500,000,000				500,000,000
Unamortized Deferred Financing Costs		(2,866,000)				(4,155,000)
Carrying Amount		497,134,000				495,845,000
Fair Value		$ 503,750,000				488,750,000
Stated interest rate (as a percent)		4.375%	4.375%	4.375%	4.375%
Senior Notes 6% percent due 2023
Debt Instrument [Line Items]
Debt (inclusive of discount)		$ 600,000,000				600,000,000
Unamortized Deferred Financing Costs		(4,302,000)				(5,126,000)
Carrying Amount		595,698,000				594,874,000
Fair Value		$ 615,000,000				606,000,000
Stated interest rate (as a percent)		6.00%	6.00%	6.00%	6.00%
CAD Senior Notes 5.375 Percent due 2023
Debt Instrument [Line Items]
Debt (inclusive of discount)		$ 188,811,000				183,403,000
Unamortized Deferred Financing Costs		(2,173,000)				(2,506,000)
Carrying Amount		186,638,000				180,897,000
Fair Value		$ 194,475,000				186,154,000
Stated interest rate (as a percent)		5.375%	5.375%	5.375%	5.375%
Senior Subordinated Notes 5 3/4% percent due 2024
Debt Instrument [Line Items]
Debt (inclusive of discount)		$ 1,000,000,000				1,000,000,000
Unamortized Deferred Financing Costs		(6,752,000)				(7,782,000)
Carrying Amount		993,248,000				992,218,000
Fair Value		$ 1,010,000,000				940,000,000
Stated interest rate (as a percent)		5.75%	5.75%	5.75%	5.75%
Euro Senior Notes 3 Percent due 2025
Debt Instrument [Line Items]
Debt (inclusive of discount)		$ 327,508,000				343,347,000
Unamortized Deferred Financing Costs		(3,622,000)				(4,098,000)
Carrying Amount		323,886,000				339,249,000
Fair Value		$ 334,877,000				321,029,000
Stated interest rate (as a percent)		3.00%	3.00%	3.00%	3.00%
GBP Senior Notes due 2025 3.875 Percent
Debt Instrument [Line Items]
Debt (inclusive of discount)		$ 491,943,000				509,425,000
Unamortized Deferred Financing Costs		(5,651,000)				(6,573,000)
Carrying Amount		486,292,000				502,852,000
Fair Value		$ 493,173,000				453,811,000
Stated interest rate (as a percent)		3.875%	3.875%	3.875%	3.875%
Senior Notes 5.375 Percent due 2026
Debt Instrument [Line Items]
Debt (inclusive of discount)		$ 250,000,000				250,000,000
Unamortized Deferred Financing Costs		(2,863,000)				(3,185,000)
Carrying Amount		247,137,000				246,815,000
Fair Value		$ 257,500,000				224,375,000
Stated interest rate (as a percent)		5.375%	5.375%	5.375%	5.375%
Senior Notes 4.875 Percent due 2027
Debt Instrument [Line Items]
Debt (inclusive of discount)		$ 1,000,000,000				1,000,000,000
Unamortized Deferred Financing Costs		(11,375,000)				(12,442,000)
Carrying Amount		988,625,000				987,558,000
Fair Value		$ 1,022,500,000				855,000,000
Stated interest rate (as a percent)		4.875%	4.875%	4.875%	4.875%
Senior Notes 5.25 Percent due 2028
Debt Instrument [Line Items]
Debt (inclusive of discount)		$ 825,000,000				825,000,000
Unamortized Deferred Financing Costs		(10,037,000)				(10,923,000)
Carrying Amount		814,963,000				814,077,000
Fair Value		$ 852,844,000				713,625,000
Stated interest rate (as a percent)		5.25%	5.25%	5.25%	5.25%
Senior Notes 4.875 Percent due 2029
Debt Instrument [Line Items]
Debt (inclusive of discount)		$ 1,000,000,000				0
Unamortized Deferred Financing Costs		(14,451,000)				0
Carrying Amount		985,549,000				0
Fair Value		$ 1,015,000,000				0
Stated interest rate (as a percent)		4.875%	4.875%	4.875%	4.875%
Principal amount		$ 1,000,000,000
Net proceeds	$ 987,500,000
Real Estate Mortgages, Capital Leases and Other
Debt Instrument [Line Items]
Debt (inclusive of discount)		533,549,000				606,702,000
Unamortized Deferred Financing Costs		(444,000)				(171,000)
Carrying Amount		533,105,000				606,531,000
Fair Value		533,549,000				606,702,000
Accounts Receivable Securitization Program
Debt Instrument [Line Items]
Debt (inclusive of discount)		271,562,000				221,673,000
Unamortized Deferred Financing Costs		(115,000)				(218,000)
Carrying Amount		271,447,000				221,455,000
Fair Value		$ 271,562,000				221,673,000
Average interest rate (as a percent)		3.10%	3.10%	3.10%	3.10%
Mortgage Securitization Program
Debt Instrument [Line Items]
Debt (inclusive of discount)		$ 50,000,000				50,000,000
Unamortized Deferred Financing Costs		(1,019,000)				(1,128,000)
Carrying Amount		48,981,000				48,872,000
Fair Value		$ 50,000,000				50,000,000
Average interest rate (as a percent)		3.50%	3.50%	3.50%	3.50%
New Credit Agreement
Debt Instrument [Line Items]
Average interest rate (as a percent)		3.50%	3.50%	3.50%	3.50%
New Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Debt (inclusive of discount)		$ 354,879,000				793,832,000
Unamortized Deferred Financing Costs		(11,763,000)				(14,117,000)
Carrying Amount		343,116,000				779,715,000
Fair Value		$ 354,879,000				793,832,000
Average interest rate (as a percent)		3.30%	3.30%	3.30%	3.30%
Term Loan A | Term Loan Facility
Debt Instrument [Line Items]
Debt (inclusive of discount)		$ 231,250,000				240,625,000
Unamortized Deferred Financing Costs		0				0
Carrying Amount		231,250,000				240,625,000
Fair Value		$ 231,250,000				240,625,000
Average interest rate (as a percent)		3.80%	3.80%	3.80%	3.80%
Term Loan B | Term Loan Facility
Debt Instrument [Line Items]
Debt (inclusive of discount)		$ 688,089,000				693,169,000
Unamortized Deferred Financing Costs		(7,806,000)				(8,742,000)
Carrying Amount		680,283,000				684,427,000
Fair Value		$ 688,638,000				660,013,000
Average interest rate (as a percent)		3.80%	3.80%	3.80%	3.80%
Debt instrument, unamortized discount		$ 1,411,000				1,581,000
UK Bilateral Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Debt (inclusive of discount)		172,180,000				178,299,000
Unamortized Deferred Financing Costs		(1,845,000)				(2,357,000)
Carrying Amount		170,335,000				175,942,000
Fair Value		$ 172,180,000				$ 178,299,000
Line of credit facility, interest rate at period end		3.00%	3.00%	3.00%	3.00%
Term Loan Facility | Term Loan B | Loans Payable
Debt Instrument [Line Items]
Maximum borrowing capacity							$ 700,000,000
US Dollars | New Credit Agreement | Term Loan Facility
Debt Instrument [Line Items]
Debt (inclusive of discount)		$ 221,900,000
Canadian dollars | New Credit Agreement | Term Loan Facility
Debt Instrument [Line Items]
Debt (inclusive of discount)					$ 72,000
Euro | New Credit Agreement | Term Loan Facility
Debt Instrument [Line Items]
Debt (inclusive of discount) | €			€ 72,000