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Debt Schedule of Long Term Debt (Details) $ in Thousands, $ in Thousands	Mar. 31, 2018 USD ($)	Mar. 31, 2018 AUD ($)	Mar. 27, 2018 AUD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2017 AUD ($)	Aug. 21, 2017 USD ($)	Sep. 28, 2016 AUD ($)
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 8,250,658			$ 7,129,511
Unamortized Debt Issuance Expense	(92,587)			(86,240)
Long-term Debt	8,158,071			7,043,271
Long-term Debt, Gross, Current Maturities	(137,198)			(146,300)
Unamortized Debt Issuance Expense, Current	0			0
Long-term Debt, Current Maturities	(137,198)			(146,300)
Long Term Debt, Gross, Net of Current Portion	8,113,460			6,983,211
Unamortized Debt Issuance Expense, Net	92,587			86,240
Long-term Debt, Excluding Current Maturities	8,020,873			6,896,971
Senior Notes 4.375 Percent due 2021 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	500,000			500,000
Fair Value	$ 501,250			$ 507,500
Stated interest rate (as a percent)	4.375%	4.375%		4.375%	4.375%
Unamortized Debt Issuance Expense	$ (5,444)			$ (5,874)
Long-term Debt	494,556			494,126
Australian Dollar Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount		$ 2,231			$ 1,545
Long-term Debt, Gross	259,431		$ 350,000	187,504			$ 250,000
Fair Value	261,662	$ 340,625		189,049
Unamortized Debt Issuance Expense	(3,761)			(3,382)
Long-term Debt	255,670			184,122
6% Notes
Debt Instrument [Line Items]
Long-term Debt, Gross	600,000			600,000
Fair Value	$ 618,000			$ 625,500
Stated interest rate (as a percent)	6.00%	6.00%		6.00%	6.00%
Unamortized Debt Issuance Expense	$ (5,949)			$ (6,224)
Long-term Debt	594,051			593,776
CAD 5.375 Percent Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	193,826			199,171
Fair Value	$ 196,482			$ 208,631
Stated interest rate (as a percent)	5.375%	5.375%		5.375%	5.375%
Unamortized Debt Issuance Expense	$ (3,067)			$ (3,295)
Long-term Debt	190,759			195,876
The 5 3/4% Notes
Debt Instrument [Line Items]
Long-term Debt, Gross	1,000,000			1,000,000
Fair Value	$ 970,000			$ 1,012,500
Stated interest rate (as a percent)	5.75%	5.75%		5.75%	5.75%
Unamortized Debt Issuance Expense	$ (8,812)			$ (9,156)
Long-term Debt	991,188			990,844
Euro Notes 3 Percent due 2025 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	369,711			359,386
Fair Value	$ 366,014			$ 364,776
Stated interest rate (as a percent)	3.00%	3.00%		3.00%	3.00%
Unamortized Debt Issuance Expense	$ (4,567)			$ (4,691)
Long-term Debt	365,144			354,695
GBP Notes due 2025 3.875 Percent [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	560,516			539,702
Fair Value	$ 529,789			$ 527,559
Stated interest rate (as a percent)	3.875%	3.875%		3.875%	3.875%
Unamortized Debt Issuance Expense	$ (7,758)			$ (7,718)
Long-term Debt	552,758			531,984
Senior Notes 5.375 Percent due 2026
Debt Instrument [Line Items]
Long-term Debt, Gross	250,000			250,000
Fair Value	$ 240,313			$ 256,875
Stated interest rate (as a percent)	5.375%	5.375%		5.375%	5.375%
Unamortized Debt Issuance Expense	$ (3,508)			$ (3,615)
Long-term Debt	246,492			246,385
Senior Notes 4.875 Percent due 2027
Debt Instrument [Line Items]
Long-term Debt, Gross	1,000,000			1,000,000
Fair Value	$ 927,500			$ 1,000,000
Stated interest rate (as a percent)	4.875%	4.875%		4.875%	4.875%
Unamortized Debt Issuance Expense	$ (13,509)			$ (13,866)
Long-term Debt	986,491			986,134
Senior Notes due 2028 5.25 Percent [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	825,000			825,000
Fair Value	$ 773,438			$ 826,031
Stated interest rate (as a percent)	5.25%	5.25%		5.25%	5.25%
Unamortized Debt Issuance Expense	$ (11,817)			$ (11,817)
Long-term Debt	813,183			813,183
Accounts Receivable Securitization Program
Debt Instrument [Line Items]
Long-term Debt, Gross	272,273			258,973
Fair Value	272,273			258,973
Unamortized Debt Issuance Expense	(321)			(356)
Long-term Debt	271,952			258,617
Real Estate Mortgages, Capital Leases and Other
Debt Instrument [Line Items]
Long-term Debt, Gross	630,868			649,432
Fair Value	630,868			649,432
Unamortized Debt Issuance Expense	(451)			(566)
Long-term Debt	630,417			648,866
Mortgage Securitization Program [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	50,000			50,000
Fair Value	50,000			50,000
Unamortized Debt Issuance Expense	(1,237)			(1,273)
Long-term Debt	48,763			48,727
New Credit Agreement | Term Loan Facility
Debt Instrument [Line Items]
Long-term Debt, Gross						$ 250,000
New Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term Debt, Gross	800,158			466,593
Fair Value	800,158			466,593
Unamortized Debt Issuance Expense	(13,688)			(14,407)
Long-term Debt	786,470			452,186
Term Loan A [Member] | Term Loan Facility
Debt Instrument [Line Items]
Long-term Debt, Gross	240,625			243,750
Fair Value	240,625			243,750
Unamortized Debt Issuance Expense	0			0
Long-term Debt	240,625			243,750
Term Loan B [Member] | Term Loan Facility
Debt Instrument [Line Items]
Long-term Debt, Gross	698,250			0
Fair Value	700,000			0
Unamortized Debt Issuance Expense	(8,698)			0
Long-term Debt	$ 689,552			$ 0

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