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Debt - Carrying Values and Estimated Fair Values of Debt Instruments (Details) - Senior Notes - USD ($) | Sep. 30, 2024 | Dec. 31, 2023 | May 31, 2023 | May 31, 2020
--- | --- | --- | --- | ---
Senior Convertible Notes |  |  |  |
Total principal amount | $ 2,457,500,000 | $ 2,457,500,000 |  |
Unamortized debt issuance costs | (17,900,000) | (23,300,000) |  |
Carrying amount of senior convertible notes | 2,439,600,000 | 2,434,200,000 |  |
Senior Convertible Notes due 2025 |  |  |  |
Senior Convertible Notes |  |  |  |
Total principal amount | 1,207,500,000 | 1,207,500,000 |  | $ 1,210,000,000
Senior Convertible Notes due 2028 |  |  |  |
Senior Convertible Notes |  |  |  |
Total principal amount | $ 1,250,000,000 | $ 1,250,000,000 | $ 1,250,000,000 |

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of a written promise to pay a note, initially due after one year or beyond the operating cycle if longer, which can be exchanged for a specified amount of one or more securities (typically common stock), at the option of the issuer or the holder. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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