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v3.21.2

Debt, Commitments and Contingencies - Convertible Senior Notes (Details) |  | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jan. 20, 2021 USD ($) day $ / shares | Jun. 30, 2021 USD ($) $ / shares | Jun. 30, 2020 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Oct. 06, 2017 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from convertible debt |  | $ 500,000,000 | $ 0 |  |  |
Share price (in dollars per share) | $ / shares |  | $ 84.70 |  |  |  |
Convertible Senior Notes due 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Proceeds from convertible debt | $ 484,300,000 |  |  |  |  |
Debt issuance costs | $ 15,700,000 |  |  |  |  |
Debt instrument, redemption price, percentage | 100.00% |  |  |  |  |
Conversion ratio | 6.7939 |  |  |  |  |
Conversion price (in dollars per share) | $ / shares | $ 147.19 |  |  |  |  |
Liability component of debt issuance costs, amortized and unamortized | $ 13,300,000 |  |  |  |  |
Debt discount and debt issuance cost deferred tax liability |  |  |  | $ 18,300,000 |  |
Convertible Senior Notes due 2026 | Redemption period one |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, redemption price, percentage | 100.00% |  |  |  |  |
Threshold percentage stock price trigger | 130.00% |  |  |  |  |
Trading days threshold | day | 20 |  |  |  |  |
Consecutive trading days threshold | day | 30 |  |  |  |  |
Convertible Senior Notes due 2026 | Redemption period two |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Threshold percentage stock price trigger | 130.00% |  |  |  |  |
Trading days threshold | day | 20 |  |  |  |  |
Consecutive trading days threshold | day | 30 |  |  |  |  |
Number of business days | day | 5 |  |  |  |  |
Number of consecutive trading days | day | 10 |  |  |  |  |
Percentage of last reported sale price threshold | 98.00% |  |  |  |  |
Senior Notes | Convertible Senior Notes due 2026 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount | $ 500,000,000.0 |  |  |  |  |
Debt instrument, interest rate | 0.00% |  |  |  |  |
Effective interest rate | 4.00% |  |  |  |  |
Debt instrument, fair value |  | $ 467,100,000 |  |  |  |
Revolving Credit Facility | Line of Credit | 2017 Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 110,000,000.0 | $ 0 |  |  | $ 110,000,000.0 | $ 72,000,000.0

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