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Debt - Schedule of Long Term Debt (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
DEBT (INCLUSIVE OF DISCOUNT) | $ 9,006,510 | $ 8,797,424 |
UNAMORTIZED DEFERRED FINANCING COSTS | (90,184) | (94,110) |
CARRYING AMOUNT | 8,916,326 | 8,703,314 |
Long-term debt, gross, current maturities | (363,911) | (193,759) |
Long term debt, gross, net of current portion | 8,642,599 | 8,603,665 |
Unamortized debt issuance expense, net of current portion | 0 | 0 |
Unamortized debt issuance expense, net | (90,184) | (94,110) |
Carrying amount, current maturities | (363,911) | (193,759) |
Carrying amount, excluding current maturities | 8,552,415 | 8,509,555 |
Australian Dollar Term Loan (the AUD Term Loan) |  |  |
Debt Instrument [Line Items] |  |  |
DEBT (INCLUSIVE OF DISCOUNT) | 238,433 | 243,152 |
UNAMORTIZED DEFERRED FINANCING COSTS | (1,374) | (1,624) |
CARRYING AMOUNT | 237,059 | 241,528 |
FAIR VALUE | 239,162 | 244,014 |
Real Estate Mortgages, Financing Lease Liabilities and Other |  |  |
Debt Instrument [Line Items] |  |  |
DEBT (INCLUSIVE OF DISCOUNT) | 492,256 | 511,922 |
UNAMORTIZED DEFERRED FINANCING COSTS | (1,003) | (1,086) |
CARRYING AMOUNT | 491,253 | 510,836 |
FAIR VALUE | 492,256 | 511,922 |
Accounts Receivable Securitization Program |  |  |
Debt Instrument [Line Items] |  |  |
DEBT (INCLUSIVE OF DISCOUNT) | 257,000 | 85,000 |
UNAMORTIZED DEFERRED FINANCING COSTS | (135) | (152) |
CARRYING AMOUNT | 256,865 | 84,848 |
FAIR VALUE | 257,000 | $ 85,000 |
Credit Agreement |  |  |
Debt Instrument [Line Items] |  |  |
Letters of credit outstanding | 38,160 |  |
Revolving Credit Facility | Credit Agreement |  |  |
Debt Instrument [Line Items] |  |  |
Letters of credit outstanding | 3,219 |  |
Remaining capacity | 1,686,781 |  |
Weighted average interest rate |  | 1.90% | 1.90%
New Credit Agreement | Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
DEBT (INCLUSIVE OF DISCOUNT) | 60,000 | $ 0 |
UNAMORTIZED DEFERRED FINANCING COSTS | (7,758) | (8,620) |
CARRYING AMOUNT | 52,242 | (8,620) |
FAIR VALUE | 60,000 | 0 |
Term Loan A | Term Loan Facility |  |  |
Debt Instrument [Line Items] |  |  |
DEBT (INCLUSIVE OF DISCOUNT) | 212,500 | 215,625 |
UNAMORTIZED DEFERRED FINANCING COSTS | 0 | 0 |
CARRYING AMOUNT | 212,500 | 215,625 |
FAIR VALUE | 212,500 | 215,625 |
Term Loan B | Term Loan Facility |  |  |
Debt Instrument [Line Items] |  |  |
DEBT (INCLUSIVE OF DISCOUNT) | 677,927 | 679,621 |
UNAMORTIZED DEFERRED FINANCING COSTS | (5,932) | (6,244) |
CARRYING AMOUNT | 671,995 | 673,377 |
FAIR VALUE | 679,000 | 680,750 |
UK Bilateral Revolving Credit Facility | Revolving Credit Facility |  |  |
Debt Instrument [Line Items] |  |  |
DEBT (INCLUSIVE OF DISCOUNT) | 192,732 | 191,101 |
UNAMORTIZED DEFERRED FINANCING COSTS | (1,147) | (1,307) |
CARRYING AMOUNT | 191,585 | 189,794 |
FAIR VALUE | $ 192,732 | 191,101 |
GBP Senior Notes due 2025 3.875 Percent | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate (as a percent) | 3.875% |  |
DEBT (INCLUSIVE OF DISCOUNT) | $ 550,662 | 546,003 |
UNAMORTIZED DEFERRED FINANCING COSTS | (4,765) | (4,983) |
CARRYING AMOUNT | 545,897 | 541,020 |
FAIR VALUE | $ 556,180 | 553,101 |
Senior Notes 4.875 Percent due 2027 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate (as a percent) | 4.875% |  |
DEBT (INCLUSIVE OF DISCOUNT) | $ 1,000,000 | 1,000,000 |
UNAMORTIZED DEFERRED FINANCING COSTS | (9,243) | (9,598) |
CARRYING AMOUNT | 990,757 | 990,402 |
FAIR VALUE | $ 1,025,000 | 1,046,250 |
Senior Notes 5.25 Percent due 2028 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate (as a percent) | 5.25% |  |
DEBT (INCLUSIVE OF DISCOUNT) | $ 825,000 | 825,000 |
UNAMORTIZED DEFERRED FINANCING COSTS | (8,266) | (8,561) |
CARRYING AMOUNT | 816,734 | 816,439 |
FAIR VALUE | $ 856,969 | 868,313 |
Senior Notes 5 Percent Due 2028 Member | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate (as a percent) | 5.00% |  |
DEBT (INCLUSIVE OF DISCOUNT) | $ 500,000 | 500,000 |
UNAMORTIZED DEFERRED FINANCING COSTS | (5,306) | (5,486) |
CARRYING AMOUNT | 494,694 | 494,514 |
FAIR VALUE | $ 511,250 | 523,125 |
Senior Notes 4.875 Percent due 2029 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate (as a percent) | 4.875% |  |
DEBT (INCLUSIVE OF DISCOUNT) | $ 1,000,000 | 1,000,000 |
UNAMORTIZED DEFERRED FINANCING COSTS | (12,296) | (12,658) |
CARRYING AMOUNT | 987,704 | 987,342 |
FAIR VALUE | $ 1,011,250 | 1,050,000 |
Senior Notes 5.25 Percent Due 2030 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate (as a percent) | 5.25% |  |
DEBT (INCLUSIVE OF DISCOUNT) | $ 1,300,000 | 1,300,000 |
UNAMORTIZED DEFERRED FINANCING COSTS | (14,040) | (14,416) |
CARRYING AMOUNT | 1,285,960 | 1,285,584 |
FAIR VALUE | $ 1,335,750 | 1,400,750 |
Senior Notes 4.5 Percent Due 2031 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate (as a percent) | 4.50% |  |
DEBT (INCLUSIVE OF DISCOUNT) | $ 1,100,000 | 1,100,000 |
UNAMORTIZED DEFERRED FINANCING COSTS | (12,337) | (12,648) |
CARRYING AMOUNT | 1,087,663 | 1,087,352 |
FAIR VALUE | $ 1,080,750 | 1,138,500 |
Senior Notes 5.625 Percent Due 2032 | Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate (as a percent) | 5.625% |  |
DEBT (INCLUSIVE OF DISCOUNT) | $ 600,000 | 600,000 |
UNAMORTIZED DEFERRED FINANCING COSTS | (6,582) | (6,727) |
CARRYING AMOUNT | 593,418 | 593,273 |
FAIR VALUE | $ 625,500 | $ 660,000 |

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