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Debt - Convertible senior notes (Narrative) (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 USD ($) $ / shares | Jun. 30, 2023 USD ($) | Mar. 31, 2021 USD ($) | Jun. 30, 2024 USD ($) d $ / shares | Jun. 30, 2023 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from convertible debt |  |  | $ 1,400.0 |  |
Convertible Scenario One |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Convertible debt, threshold trading days | d |  |  |  | 20 |
Convertible debt, threshold consecutive trading days | d |  |  |  | 30 |
Convertible debt, threshold percentage of stock price trigger |  |  |  | 130.00% |
Convertible Scenario Two |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Convertible debt, threshold trading days | d |  |  |  | 5 |
Convertible debt, threshold consecutive trading days | d |  |  |  | 5 |
Convertible debt, threshold percentage of stock price trigger |  |  |  | 98.00% |
Convertible Scenario Three |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Convertible debt, threshold trading days | d |  |  |  | 20 |
Convertible debt, threshold consecutive trading days | d |  |  |  | 30 |
Convertible debt, threshold percentage of stock price trigger |  |  |  | 130.00% |
Convertible Debt | Convertible Scenario Three |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Convertible debt, redemption percentage |  |  |  | 100.00% |
Convertible Debt | Convertible Scenario Four |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Convertible debt, redemption percentage |  |  |  | 100.00% |
2026 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Convertible debt, conversion rate |  |  |  | 0.0261458 |
Convertible debt, conversion rate (in dollars per share) | $ / shares | $ 38.25 |  |  | $ 38.25 |
Interest expense | $ 0.6 | $ 0.5 |  | $ 1.1 | $ 1.1
2026 Notes | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Convertible debt, conversion rate |  |  |  | 0.0431406 |
2026 Notes | Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from convertible debt |  |  | 695.8 |  |
Debt issuance costs | $ 11.0 |  |  | $ 11.0 |
Debt instrument, term |  |  |  | 5 years |
Effective interest rate | 0.32% |  |  | 0.32% |
2028 Notes |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Convertible debt, conversion rate |  |  |  | 0.0282889 |
Convertible debt, conversion rate (in dollars per share) | $ / shares | $ 35.35 |  |  | $ 35.35 |
Interest expense | $ 0.4 | $ 0.4 |  | $ 0.8 | $ 0.8
2028 Notes | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Convertible debt, conversion rate |  |  |  | 0.0431406 |
2028 Notes | Convertible Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Proceeds from convertible debt |  |  | $ 693.3 |  |
Debt issuance costs | $ 11.0 |  |  | $ 11.0 |
Debt instrument, term |  |  |  | 7 years |
Effective interest rate | 0.22% |  |  | 0.22% |

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