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Convertible Senior Notes - Narrative (Details) |  |  |  | 3 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) $ / shares | Apr. 14, 2020 USD ($) day $ / shares | Apr. 09, 2020 USD ($) | Mar. 31, 2021 USD ($) day $ / shares shares | Apr. 08, 2020 $ / instrument
Line of Credit Facility [Line Items] |  |  |  |  |
Amount borrowed |  | $ 1,000 |  |  |
Share price (in USD per share) | $ / shares | $ 46.77 |  |  | $ 46.77 |
Cash Flow Hedging | Capped Call | Designated as Hedging Instrument |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Derivative, cost of hedge |  |  | $ 21,700,000 |  |
Cap price (in dollars per share) | $ / instrument |  |  |  |  | 42.00
Convertible Notes Payable |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Convertible debt liability component fair value disclosure |  | 63,300,000 |  |  |
Senior Notes Due 2025 | Convertible Notes Payable |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Proceeds allocated to the conversion option (debt discount) | $ 63,270,000 | $ 230,000,000.0 |  | $ 63,270,000 |
Basis rate (in percentage) |  | 2.50% |  |  |
Proceeds from issuance of debt |  | $ 222,500,000 |  |  |
Debt instrument, convertible, threshold percentage of stock price trigger |  | 130.00% |  | 130.00% |
Threshold trading days | day |  | 20 |  | 20 |
Threshold consecutive trading days | day |  | 30 |  | 30 |
Redemption price, percentage |  | 100.00% |  |  |
Number of shares issued in conversion (in shares) | shares |  |  |  | 0.00326797 |
Amount borrowed | $ 391,300,000 | $ 230,000,000.0 |  | $ 391,300,000 |
Conversion price (in dollars per share) | $ / shares | $ 30.60 | $ 30.60 |  | $ 30.60 |
Convertible debt liability component fair value disclosure |  | $ 166,700,000 |  |  |
Debt issuance cost gross liability component |  | 5,500,000 |  |  |
Debt issuance cost gross equity component |  | $ 2,100,000 |  |  |
Debt instrument, convertible, if-converted value in excess of principal | $ 121,500,000 |  |  |  |
Senior Notes Due 2025 | Convertible Notes Payable | Measurement Input, Discount Rate |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, measurement input |  | 0.10 |  |  |
Senior Notes Due 2025 | Convertible Notes Payable | Debt Instrument Convertible Sale Price Of Stock Threshold |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt instrument, convertible, threshold percentage of stock price trigger |  | 98.00% |  |  |
Threshold trading days | day |  | 5 |  |  |

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- Definition The number of shares issued in exchange for 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 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 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 Reference 2: 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=121583591&loc=d3e4304-108586 + Details
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