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v3.21.1

Assets and Liabilities Measured at Fair Value (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 18, 2020
1.75% Exchangeable Senior Debentures due 2046 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Interest rate (as a percent) | 1.75% |  | 1.75% |
1.25% Exchangeable Senior Debentures due 2050 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Interest rate (as a percent) | 1.25% |  | 1.25% |
2.75% Exchangeable Senior Debentures due 2050 |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Interest rate (as a percent) | 2.75% |  | 2.75% |
Exchangeable senior debentures |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Change in fair value |  | $ 0 |  |
Cumulative change | $ 8,800,000 |  |  |
Exchangeable senior debentures | 1.75% Exchangeable Senior Debentures due 2046 | Indemnification obligation |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Indemnity obligation recorded |  |  |  | $ 336,100,000
Exchangeable senior debentures | 1.75% Exchangeable Senior Debentures due 2046 | Indemnification obligation | LI LLC |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Interest rate (as a percent) | 1.75% |  |  |
Exchangeable senior debentures |  |  |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |  |  |
Change in fair value | $ 205,000 |  |  |

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