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Fair Value Measurements - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 31, 2021 | May 31, 2021 | Sep. 30, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
1.50% Convertible Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Convertible notes exchanged | $ 169,100,000 | $ 250,000,000 | $ 169,000,000 | $ 419,000,000 |  |
Convertible Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Fair value |  |  | 150,200,000 | 150,200,000 | $ 828,200,000 | $ 624,800,000
Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Fair value |  |  | $ 622,500,000 | $ 622,500,000 | $ 602,600,000 | $ 566,600,000

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- Definition The amount of the original debt being converted in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=123431023&loc=d3e4332-108586 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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