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Debt - Schedule of Carrying Values and Estimated Fair Values of Debt Instruments (Details) - Senior Notes - USD ($) | Dec. 31, 2022 | Dec. 31, 2021 | May 31, 2020 | Nov. 30, 2018
--- | --- | --- | --- | ---
Senior Convertible Notes |  |  |  |
Total principal amount | $ 1,982,300,000 | $ 1,999,800,000 |  |
Unamortized debt issuance costs | (12,000,000.0) | (18,000,000.0) |  |
Carrying amount of senior convertible notes | 1,970,300,000 | 1,981,800,000 |  |
Convertible Notes due 2023 |  |  |  |
Senior Convertible Notes |  |  |  |
Total principal amount | 774,800,000 | 792,300,000 |  | $ 850,000,000
Convertible Notes due 2025 |  |  |  |
Senior Convertible Notes |  |  |  |
Total principal amount | $ 1,207,500,000 | $ 1,207,500,000 | $ 1,210,000,000 |

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.6-04(13)) -URI https://asc.fasb.org/extlink&oid=120401414&loc=d3e603758-122996 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 + Details
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- Definition The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset. + References No definition available. + Details
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