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Debt - Senior Convertible Notes (Details) - USD ($) | Sep. 30, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | May 31, 2020 | Nov. 30, 2018
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Senior Convertible Notes |  |  |  |  |  |
Carrying amount of senior convertible notes | $ 1,968,800,000 | $ 1,981,800,000 | [1] | $ 2,033,100,000 |  |
Senior Notes |  |  |  |  |  |
Senior Convertible Notes |  |  |  |  |  |
Total principal amount | 1,982,300,000 | 1,999,800,000 |  |  |  |
Unamortized debt issuance costs | (13,500,000) | (18,000,000.0) |  |  |  |
Carrying amount of senior convertible notes | 1,968,800,000 | 1,981,800,000 |  |  |  |
Senior Notes | Senior Convertible Notes due 2023 |  |  |  |  |  |
Senior Convertible Notes |  |  |  |  |  |
Total principal amount | 774,800,000 | 792,300,000 |  |  |  | $ 850,000,000
Senior Notes | Senior Convertible Notes due 2025 |  |  |  |  |  |
Senior Convertible Notes |  |  |  |  |  |
Total principal amount | $ 1,207,500,000 | $ 1,207,500,000 |  |  | $ 1,210,000,000 |
[1] | * We adjusted our 2021 amounts to reflect the simplified convertible instruments accounting guidance, which we adopted on a full retrospective basis. All periods presented have also been adjusted to reflect the four-for-one stock split. Refer to Note 1, “Organization and Significant Accounting Policies,” for further information.

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