Debt - Schedule of Long Term Debt (Details) € in Thousands, $ in Thousands, $ in Thousands	Mar. 31, 2020 EUR (€)	Mar. 31, 2020 USD ($)	Mar. 31, 2020 CAD ($)	Mar. 31, 2020 AUD ($)	Dec. 31, 2019 USD ($)	Mar. 22, 2018 USD ($)
Debt Instrument [Line Items]
Debt (inclusive of discount)		$ 8,917,558,000			$ 8,751,544,000
Long-term debt, gross, current maturities		(127,557,000)			(389,013,000)
Long term debt, gross, net of current portion		8,790,001,000			8,362,531,000
Unamortized Deferred Financing Costs		(81,984,000)			(86,965,000)
Unamortized debt issuance expense, net		(81,984,000)			(86,965,000)
Carrying Amount		8,835,574,000			8,664,579,000
Carrying Amount, current maturities		(127,557,000)			(389,013,000)
Carrying Amount, excluding current maturities		8,708,017,000			8,275,566,000
Revolving Credit Facility
Debt Instrument [Line Items]
Letters of credit outstanding		4,851,000
Remaining capacity		1,099,546,000
Australian Dollar Term Loan
Debt Instrument [Line Items]
Debt (inclusive of discount)		197,454,000			226,924,000
Unamortized Deferred Financing Costs		(1,937,000)			(2,313,000)
Carrying Amount		195,517,000		$ 323,125	224,611,000
Fair Value		$ 198,435,000			228,156,000
Average interest rate (as a percent)	4.40%	4.40%	4.40%	4.40%
Debt instrument, unamortized discount		$ 981,000			1,232,000
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		(2,006,000)			(2,436,000)
Carrying Amount		497,994,000			497,564,000
Fair Value		$ 495,000,000			503,450,000
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		(3,752,000)			(4,027,000)
Carrying Amount		596,248,000			595,973,000
Fair Value		$ 603,000,000			613,500,000
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)		$ 176,414,000			192,058,000
Unamortized Deferred Financing Costs		(1,776,000)			(2,071,000)
Carrying Amount		174,638,000			189,987,000
Fair Value		$ 170,681,000			199,380,000
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		(6,065,000)			(6,409,000)
Carrying Amount		993,935,000			993,591,000
Fair Value		$ 992,500,000			1,010,625,000
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)		$ 330,016,000			336,468,000
Unamortized Deferred Financing Costs		(3,302,000)			(3,462,000)
Carrying Amount		326,714,000			333,006,000
Fair Value		$ 289,177,000			345,660,000
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)		$ 494,988,000			527,432,000
Unamortized Deferred Financing Costs		(5,218,000)			(5,809,000)
Carrying Amount		489,770,000			521,623,000
Fair Value		$ 443,960,000			539,892,000
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		(2,649,000)			(2,756,000)
Carrying Amount		247,351,000			247,244,000
Fair Value		$ 242,500,000			261,641,000
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		(10,664,000)			(11,020,000)
Carrying Amount		989,336,000			988,980,000
Fair Value		$ 970,000,000			1,029,475,000
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		(9,447,000)			(9,742,000)
Carrying Amount		815,553,000			815,258,000
Fair Value		$ 813,904,000			859,598,000
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			1,000,000,000
Unamortized Deferred Financing Costs		(13,742,000)			(14,104,000)
Carrying Amount		986,258,000			985,896,000
Fair Value		$ 939,380,000			1,015,640,000
Stated interest rate (as a percent)	4.875%	4.875%	4.875%	4.875%
Real Estate Mortgages, Capital Leases and Other
Debt Instrument [Line Items]
Debt (inclusive of discount)		$ 494,573,000			523,671,000
Unamortized Deferred Financing Costs		(297,000)			(406,000)
Carrying Amount		494,276,000			523,265,000
Fair Value		494,573,000			523,671,000
Accounts Receivable Securitization Program
Debt Instrument [Line Items]
Debt (inclusive of discount)		270,562,000			272,062,000
Unamortized Deferred Financing Costs		(241,000)			(81,000)
Carrying Amount		270,321,000			271,981,000
Fair Value		$ 270,562,000			272,062,000
Stated interest rate (as a percent)	2.00%	2.00%	2.00%	2.00%
Principal amount		$ 300,000,000			275,000,000
Mortgage Securitization Program
Debt Instrument [Line Items]
Debt (inclusive of discount)		50,000,000			50,000,000
Unamortized Deferred Financing Costs		(945,000)			(982,000)
Carrying Amount		49,055,000			49,018,000
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]
Weighted average interest rate	2.70%	2.70%	2.70%	2.70%
New Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Debt (inclusive of discount)		$ 645,603,000			348,808,000
Unamortized Deferred Financing Costs		(11,205,000)			(12,053,000)
Carrying Amount		634,398,000			336,755,000
Fair Value		$ 645,603,000			348,808,000
Weighted average interest rate	2.70%	2.70%	2.70%	2.70%
Term Loan A | Term Loan Facility
Debt Instrument [Line Items]
Debt (inclusive of discount)		$ 225,000,000			228,125,000
Unamortized Deferred Financing Costs		0			0
Carrying Amount		225,000,000			228,125,000
Fair Value		$ 225,000,000			228,125,000
Weighted average interest rate	2.70%	2.70%	2.70%	2.70%
Term Loan B | Term Loan Facility
Debt Instrument [Line Items]
Debt (inclusive of discount)		$ 684,702,000			686,395,000
Unamortized Deferred Financing Costs		(7,181,000)			(7,493,000)
Carrying Amount		677,521,000			678,902,000
Fair Value		$ 686,000,000			686,890,000
Average interest rate (as a percent)	2.70%	2.70%	2.70%	2.70%
Debt instrument, unamortized discount		$ 1,298,000			1,355,000
UK Bilateral Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Debt (inclusive of discount)		173,246,000			184,601,000
Unamortized Deferred Financing Costs		(1,557,000)			(1,801,000)
Carrying Amount		171,689,000			182,800,000
Fair Value		$ 173,246,000			$ 184,601,000
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 | Revolving Credit Facility
Debt Instrument [Line Items]
Debt (inclusive of discount)		$ 580,500,000
Canadian dollars | New Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Debt (inclusive of discount)			$ 28,500
Euro | New Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Debt (inclusive of discount) | €	€ 40,900