Debt (Details) € in Thousands, $ in Thousands, $ in Thousands, $ in Thousands	Mar. 31, 2019 USD ($)	Mar. 31, 2019 EUR (€)	Mar. 31, 2019 AUD ($)	Mar. 31, 2019 CAD ($)	Dec. 31, 2018 USD ($)	Mar. 22, 2018 USD ($)
Debt covenants
Long-term Debt, Gross	$ 8,574,147				$ 8,229,430
Long-term Debt	$ 8,490,879				8,142,823
New Credit Agreement
Debt
Average interest rate (as a percent)	4.00%	4.00%	4.00%	4.00%
QRS Cash Pool [Member]
Debt covenants
Cash pool agreement, net cash position	$ 2,000				2,000
Cash pool agreement, gross cash position	271,400				300,800
Cash pool agreement, outstanding borrowings	(269,400)				(298,800)
TRS Cash Pool [Member]
Debt covenants
Cash pool agreement, net cash position	3,200				2,200
Cash pool agreement, gross cash position	281,100				281,500
Cash pool agreement, outstanding borrowings	$ (277,900)				$ (279,300)
Credit Agreement
Debt covenants
Net total lease adjusted leverage ratio	5.8	5.8	5.8	5.8	5.6
Net secured debt lease adjusted leverage ratio	2.8	2.8	2.8	2.8	2.6
Bond leverage ratio, per indentures	6.1	6.1	6.1	6.1	5.8
Fixed charge coverage ratio	2.2	2.2	2.2	2.2	2.2
Credit Agreement | Minimum
Debt covenants
Fixed charge coverage ratio	1.5	1.5	1.5	1.5
Credit Agreement | Maximum
Debt covenants
Net total lease adjusted leverage ratio	6.5	6.5	6.5	6.5
Net secured debt lease adjusted leverage ratio	4.0	4.0	4.0	4.0
Bond leverage ratio, per indentures	6.5	6.5	6.5	6.5
Revolving Credit Facility
Debt
Letters of credit outstanding	$ 37,271
Remaining amount available for borrowing under credit facility	$ 573,163
Revolving Credit Facility | New Credit Agreement
Debt
Average interest rate (as a percent)	4.00%	4.00%	4.00%	4.00%
Fair Value	$ 1,139,566				$ 793,832
Debt covenants
Long-term Debt, Gross	1,139,566				793,832
Long-term Debt	1,126,234				779,715
Revolving Credit Facility | UK Bilateral Revolving Credit Facility
Debt
Fair Value	182,450				178,299
Debt covenants
Long-term Debt, Gross	182,450				178,299
Long-term Debt	180,195				175,942
Term Loan Facility | New Credit Agreement | USD
Debt covenants
Long-term Debt, Gross	$ 965,800
Term Loan Facility | New Credit Agreement | Canada, Dollars
Debt covenants
Long-term Debt, Gross				$ 94,200
Term Loan Facility | New Credit Agreement | EUR
Debt covenants
Long-term Debt, Gross | €		€ 92,000
Term Loan Facility | Term Loan A [Member]
Debt
Average interest rate (as a percent)	4.20%	4.20%	4.20%	4.20%
Fair Value	$ 237,500				240,625
Debt covenants
Long-term Debt, Gross	237,500				240,625
Long-term Debt	$ 237,500				240,625
Term Loan Facility | Term Loan B [Member]
Debt
Average interest rate (as a percent)	4.30%	4.30%	4.30%	4.30%
Debt Instrument, Unamortized Discount	$ 1,524				1,581
Fair Value	670,478				660,013
Debt covenants
Long-term Debt, Gross	691,476				693,169
Long-term Debt	$ 683,046				$ 684,427
Loans Payable [Member] | Term Loan B [Member] | Term Loan Facility
Debt
Maximum borrowing capacity						$ 700,000
Euro Notes 3 Percent due 2025 [Member]
Debt
Stated interest rate (as a percent)	3.00%	3.00%	3.00%	3.00%	3.00%
Fair Value	$ 337,684				$ 321,029
Debt covenants
Long-term Debt, Gross	336,557				343,347
Long-term Debt	$ 332,616				$ 339,249
Senior Notes 4.875 Percent due 2027
Debt
Stated interest rate (as a percent)	4.875%	4.875%	4.875%	4.875%	4.875%
Fair Value	$ 957,500				$ 855,000
Debt covenants
Long-term Debt, Gross	1,000,000				1,000,000
Long-term Debt	$ 987,914				$ 987,558
Senior Notes 5.375 Percent due 2026
Debt
Stated interest rate (as a percent)	5.375%	5.375%	5.375%	5.375%	5.375%
Fair Value	$ 246,875				$ 224,375
Debt covenants
Long-term Debt, Gross	250,000				250,000
Long-term Debt	$ 246,922				$ 246,815
CAD 5.375 Percent Senior Notes due 2023 [Member]
Debt
Stated interest rate (as a percent)	5.375%	5.375%	5.375%	5.375%	5.375%
Fair Value	$ 189,444				$ 186,154
Debt covenants
Long-term Debt, Gross	187,262				183,403
Long-term Debt	$ 184,838				180,897
Australian Dollar Term Loan [Member]
Debt
Average interest rate (as a percent)	5.70%	5.70%	5.70%	5.70%
Debt Instrument, Unamortized Discount	$ 1,587				1,690
Fair Value	235,587				235,645
Debt covenants
Long-term Debt, Gross	234,000				233,955
Long-term Debt	$ 231,107		$ 331,875		$ 230,871