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Debt - Summary of Debt (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Outstanding principal | $ 4,543,809 |
Deferred financing costs | (1,714) | $ (2,017)
Total | 4,586,597 | 4,816,233
Debt classified as current | (29,425) | (31,026)
Total long-term debt | 4,557,172 | 4,785,207
2.75% Exchangeable Senior Debentures due 2050 |  |
Debt Instrument [Line Items] |  |
Outstanding principal | 575,000 |
Carrying value | $ 588,064 | $ 608,804
Interest rate (as a percent) | 2.75% | 2.75%
1.25% Exchangeable Senior Debentures due 2050 |  |
Debt Instrument [Line Items] |  |
Outstanding principal | $ 825,000 |
Carrying value | $ 811,536 | $ 836,971
Interest rate (as a percent) | 1.25% | 1.25%
1.75% Exchangeable Senior Debentures due 2046 |  |
Debt Instrument [Line Items] |  |
Outstanding principal | $ 14,536 |
Carrying value | $ 24,741 | $ 26,350
Interest rate (as a percent) | 1.75% | 1.75%
Senior notes |  |
Debt Instrument [Line Items] |  |
Outstanding principal | $ 600,000 |
Carrying value | 634,697 | $ 635,683
Senior Credit Facility |  |
Debt Instrument [Line Items] |  |
Outstanding principal | 523,000 |
Carrying value | 523,000 | 704,000
Wells Fargo note payable |  |
Debt Instrument [Line Items] |  |
Outstanding principal | 6,273 |
Carrying value | 6,273 | 6,442
SPV | Margin Loan Facility |  |
Debt Instrument [Line Items] |  |
Outstanding principal | 2,000,000 |
Carrying value | $ 2,000,000 | $ 2,000,000

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