Cash, cash equivalents and investments - Narrative (Details) - USD ($) $ in Millions |
3 Months Ended | 9 Months Ended | |
|---|---|---|---|
Sep. 30, 2020 |
Sep. 30, 2019 |
Sep. 30, 2019 |
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| Cash and Cash Equivalents [Abstract] | |||
| Realized gains (losses) recognized on available-for-sale investments | $ (0.2) | $ 0.1 | $ 0.2 |
| X | ||||||||||
- References No definition available.
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| X | ||||||||||
- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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