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Debt - Schedule of Long Term Debt (Details) € in Thousands, $ in Thousands, $ in Thousands, $ in Thousands | Jun. 30, 2019 USD ($) | Jun. 30, 2019 CAD ($) | Jun. 30, 2019 AUD ($) | Jun. 30, 2019 EUR (€) | Dec. 31, 2018 USD ($) | Mar. 22, 2018 USD ($)
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Debt (inclusive of discount) | $ 8,592,918 |  |  |  | $ 8,229,430 |
Long-term debt, gross, current maturities | (123,527) |  |  |  | (126,406) |
Long term debt, gross, net of current portion | 8,469,391 |  |  |  | 8,103,024 |
Unamortized Deferred Financing Costs | (79,208) |  |  |  | (86,607) |
Unamortized debt issuance expense, current | 0 |  |  |  | 0 |
Unamortized debt issuance expense, net | (79,208) |  |  |  | (86,607) |
Carrying Amount | 8,513,710 |  |  |  | 8,142,823 |
Carrying Amount, current maturities | (123,527) |  |  |  | (126,406) |
Carrying Amount, excluding current maturities | 8,390,183 |  |  |  | 8,016,417 |
Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Letters of credit outstanding | 35,250 |  |  |  |  |
Remaining capacity | 533,374 |  |  |  |  |
Australian Dollar Term Loan |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt (inclusive of discount) | 230,048 |  |  |  | 233,955 |
Unamortized Deferred Financing Costs | (2,691) |  |  |  | (3,084) |
Carrying Amount | 227,357 |  | $ 329,688 |  | 230,871 |
Fair Value | $ 231,506 |  |  |  | 235,645 |
Average interest rate (as a percent) | 5.10% | 5.10% | 5.10% | 5.10% |  |
Debt instrument, unamortized discount | $ 1,458 |  |  |  | 1,690 |
Senior Notes 4.375 Percent due 2021 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt (inclusive of discount) | 500,000 |  |  |  | 500,000 |
Unamortized Deferred Financing Costs | (3,295) |  |  |  | (4,155) |
Carrying Amount | 496,705 |  |  |  | 495,845 |
Fair Value | $ 505,000 |  |  |  | 488,750 |
Stated interest rate (as a percent) | 4.375% | 4.375% | 4.375% | 4.375% |  |
6% Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt (inclusive of discount) | $ 600,000 |  |  |  | 600,000 |
Unamortized Deferred Financing Costs | (4,576) |  |  |  | (5,126) |
Carrying Amount | 595,424 |  |  |  | 594,874 |
Fair Value | $ 612,000 |  |  |  | 606,000 |
Stated interest rate (as a percent) | 6.00% | 6.00% | 6.00% | 6.00% |  |
CAD 5.375 Percent Senior Notes due 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt (inclusive of discount) | $ 190,972 |  |  |  | 183,403 |
Unamortized Deferred Financing Costs | (2,335) |  |  |  | (2,506) |
Carrying Amount | 188,637 |  |  |  | 180,897 |
Fair Value | $ 192,882 |  |  |  | 186,154 |
Stated interest rate (as a percent) | 5.375% | 5.375% | 5.375% | 5.375% |  |
The 5 3/4% Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt (inclusive of discount) | $ 1,000,000 |  |  |  | 1,000,000 |
Unamortized Deferred Financing Costs | (7,096) |  |  |  | (7,782) |
Carrying Amount | 992,904 |  |  |  | 992,218 |
Fair Value | $ 1,010,000 |  |  |  | 940,000 |
Stated interest rate (as a percent) | 5.75% | 5.75% | 5.75% | 5.75% |  |
Euro Notes 3 Percent due 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt (inclusive of discount) | $ 341,128 |  |  |  | 343,347 |
Unamortized Deferred Financing Costs | (3,781) |  |  |  | (4,098) |
Carrying Amount | 337,347 |  |  |  | 339,249 |
Fair Value | $ 351,113 |  |  |  | 321,029 |
Stated interest rate (as a percent) | 3.00% | 3.00% | 3.00% | 3.00% |  |
GBP Notes due 2025 3.875 Percent |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt (inclusive of discount) | $ 507,891 |  |  |  | 509,425 |
Unamortized Deferred Financing Costs | (6,074) |  |  |  | (6,573) |
Carrying Amount | 501,817 |  |  |  | 502,852 |
Fair Value | $ 502,192 |  |  |  | 453,811 |
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 |  |  |  | 250,000 |
Unamortized Deferred Financing Costs | (2,971) |  |  |  | (3,185) |
Carrying Amount | 247,029 |  |  |  | 246,815 |
Fair Value | $ 252,500 |  |  |  | 224,375 |
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 |  |  |  | 1,000,000 |
Unamortized Deferred Financing Costs | (11,731) |  |  |  | (12,442) |
Carrying Amount | 988,269 |  |  |  | 987,558 |
Fair Value | $ 990,000 |  |  |  | 855,000 |
Stated interest rate (as a percent) | 4.875% | 4.875% | 4.875% | 4.875% |  |
Senior Notes due 2028 5.25 Percent |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt (inclusive of discount) | $ 825,000 |  |  |  | 825,000 |
Unamortized Deferred Financing Costs | (10,333) |  |  |  | (10,923) |
Carrying Amount | 814,667 |  |  |  | 814,077 |
Fair Value | $ 825,000 |  |  |  | 713,625 |
Stated interest rate (as a percent) | 5.25% | 5.25% | 5.25% | 5.25% |  |
Real Estate Mortgages, Capital Leases and Other |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt (inclusive of discount) | $ 559,622 |  |  |  | 606,702 |
Unamortized Deferred Financing Costs | (425) |  |  |  | (171) |
Carrying Amount | 559,197 |  |  |  | 606,531 |
Fair Value | 559,622 |  |  |  | 606,702 |
Accounts Receivable Securitization Program |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt (inclusive of discount) | 254,962 |  |  |  | 221,673 |
Unamortized Deferred Financing Costs | (149) |  |  |  | (218) |
Carrying Amount | 254,813 |  |  |  | 221,455 |
Fair Value | $ 254,962 |  |  |  | 221,673 |
Average interest rate (as a percent) | 3.40% | 3.40% | 3.40% | 3.40% |  |
Mortgage Securitization Program |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt (inclusive of discount) | $ 50,000 |  |  |  | 50,000 |
Unamortized Deferred Financing Costs | (1,055) |  |  |  | (1,128) |
Carrying Amount | 48,945 |  |  |  | 48,872 |
Fair Value | $ 50,000 |  |  |  | 50,000 |
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) | 4.00% | 4.00% | 4.00% | 4.00% |  |
New Credit Agreement | Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt (inclusive of discount) | $ 1,181,376 |  |  |  | 793,832 |
Unamortized Deferred Financing Costs | (12,548) |  |  |  | (14,117) |
Carrying Amount | 1,168,828 |  |  |  | 779,715 |
Fair Value | $ 1,181,376 |  |  |  | 793,832 |
Average interest rate (as a percent) | 4.00% | 4.00% | 4.00% | 4.00% |  |
Term Loan A | Term Loan Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt (inclusive of discount) | $ 234,375 |  |  |  | 240,625 |
Unamortized Deferred Financing Costs | 0 |  |  |  | 0 |
Carrying Amount | 234,375 |  |  |  | 240,625 |
Fair Value | $ 234,375 |  |  |  | 240,625 |
Average interest rate (as a percent) | 4.20% | 4.20% | 4.20% | 4.20% |  |
Term Loan B | Term Loan Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt (inclusive of discount) | $ 689,782 |  |  |  | 693,169 |
Unamortized Deferred Financing Costs | (8,118) |  |  |  | (8,742) |
Carrying Amount | 681,664 |  |  |  | 684,427 |
Fair Value | $ 668,784 |  |  |  | 660,013 |
Average interest rate (as a percent) | 4.20% | 4.20% | 4.20% | 4.20% |  |
Debt instrument, unamortized discount | $ 1,468 |  |  |  | 1,581 |
UK Bilateral Revolving Credit Facility | Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt (inclusive of discount) | 177,762 |  |  |  | 178,299 |
Unamortized Deferred Financing Costs | (2,030) |  |  |  | (2,357) |
Carrying Amount | 175,732 |  |  |  | 175,942 |
Fair Value | $ 177,762 |  |  |  | $ 178,299 |
Line of credit facility, interest rate at period end | 3.10% | 3.10% | 3.10% | 3.10% |  |
Term Loan Facility | Term Loan B | Loans Payable |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 700,000
US Dollars | New Credit Agreement | Term Loan Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt (inclusive of discount) | $ 1,028,900 |  |  |  |  |
Canadian dollars | New Credit Agreement | Term Loan Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt (inclusive of discount) |  | $ 76,800 |  |  |  |
Euro | New Credit Agreement | Term Loan Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt (inclusive of discount) | € |  |  |  | € 82,500 |  |

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