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Description of the Business and Summary of Significant Accounting Policies - Use of estimates (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2024 | Mar. 31, 2024 | Jan. 01, 2024 | Dec. 31, 2023
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Property and equipment, useful life |  |  |  |  |  |  | 5 years | 5 years | 4 years
Net income attributable to common stockholders |  | $ 106.7 | $ 114.1 | $ 349.5 | $ 226.3 |  |  |  |
Basic net income per share (in dollars per share) |  | $ 0.34 | $ 0.34 | $ 1.08 | $ 0.66 |  |  |  |
Diluted net income per share (in dollars per share) |  | $ 0.34 | $ 0.33 | $ 1.07 | $ 0.65 |  |  |  |
Favorable impact on cost of revenue | [1],[2] | $ (111.5) | $ (119.6) | $ (324.3) | $ (356.5) |  |  |  |
Service Life |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Reduction in depreciation expense |  | 6.9 |  | 26.3 |  |  |  |  |
Net income attributable to common stockholders |  | $ 5.2 |  | $ 20.4 |  |  |  |  |
Basic net income per share (in dollars per share) |  | $ 0.02 |  | $ 0.06 |  |  |  |  |
Diluted net income per share (in dollars per share) |  | $ 0.02 |  | $ 0.06 |  |  |  |  |
Service Life | Forecast |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Favorable impact on cost of revenue |  |  |  |  |  | $ 30.5 |  |  |
[1] | Includes expenses related to the Company's 2023 reduction in workforce such as severance, benefits and other related items during the three and nine months ended September 30, 2023.
[2] | Includes stock-based compensation as follows:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2024 |  | 2023 |  | 2024 |  | 2023
Cost of revenue | $ | 5.8 |  |  | $ | 5.8 |  |  | $ | 17.0 |  |  | $ | 17.6 |
Research and development(4) | 66.7 |  |  | 58.6 |  |  | 186.3 |  |  | 178.9 |
Sales and marketing | 6.1 |  |  | 5.2 |  |  | 17.4 |  |  | 17.0 |
General and administrative | 13.7 |  |  | 14.2 |  |  | 40.1 |  |  | 41.6 |
Total stock-based compensation | $ | 92.3 |  |  | $ | 83.8 |  |  | $ | 260.8 |  |  | $ | 255.1 |

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