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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) (Unaudited) - USD ($) shares in Millions, $ in Millions | Total | Common Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income | Accumulated Deficit | Treasury Stock, at Cost
--- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2022 |  | 215.7 |  |  |  |
Beginning balance at Dec. 31, 2022 | $ 629.5 | $ 2.2 | $ 2,573.3 | $ 71.4 | $ (1,986.4) | $ (31.0)
Beginning balance (in shares) at Dec. 31, 2022 |  |  |  |  |  | 3.1
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options and release of stock awards, net of shares withheld (in shares) |  | 3.4 |  |  |  |
Exercise of stock options and release of stock awards, net of shares withheld | (1.0) |  | (1.0) |  |  |
Issuance of shares from Employee Stock Purchase Plans (in shares) |  | 0.4 |  |  |  |
Issuance of shares from Employee Stock Purchase Plan | 0.8 |  | 0.8 |  |  |
Share-based compensation expense for equity classified awards | 50.3 |  | 50.3 |  |  |
Net loss | (865.8) |  |  |  | (865.8) |
Other comprehensive (loss) income | 3.4 |  |  | 3.4 |  |
Ending balance (in shares) at Sep. 30, 2023 |  | 219.5 |  |  |  |
Ending balance at Sep. 30, 2023 | (182.8) | $ 2.2 | 2,623.4 | 74.8 | (2,852.2) | $ (31.0)
Ending balance (in shares) at Sep. 30, 2023 |  |  |  |  |  | 3.1
Beginning balance (in shares) at Jun. 30, 2023 |  | 218.8 |  |  |  |
Beginning balance at Jun. 30, 2023 | 31.9 | $ 2.2 | 2,607.4 | 78.9 | (2,625.6) | $ (31.0)
Beginning balance (in shares) at Jun. 30, 2023 |  |  |  |  |  | 3.1
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options and release of stock awards, net of shares withheld (in shares) |  | 0.7 |  |  |  |
Exercise of stock options and release of stock awards, net of shares withheld | (1.0) |  | (1.0) |  |  |
Share-based compensation expense for equity classified awards | 17.0 |  | 17.0 |  |  |
Net loss | (226.6) |  |  |  | (226.6) |
Other comprehensive (loss) income | (4.1) |  |  | (4.1) |  |
Ending balance (in shares) at Sep. 30, 2023 |  | 219.5 |  |  |  |
Ending balance at Sep. 30, 2023 | $ (182.8) | $ 2.2 | 2,623.4 | 74.8 | (2,852.2) | $ (31.0)
Ending balance (in shares) at Sep. 30, 2023 |  |  |  |  |  | 3.1
Beginning balance (in shares) at Dec. 31, 2023 | 217.4 | 220.5 |  |  |  |
Beginning balance at Dec. 31, 2023 | $ (154.5) | $ 2.2 | 2,638.2 | 60.3 | (2,824.2) | $ (31.0)
Beginning balance (in shares) at Dec. 31, 2023 | 3.1 |  |  |  |  | 3.1
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options and release of stock awards, net of shares withheld (in shares) |  | 9.9 |  |  |  |
Exercise of stock options and release of stock awards, net of shares withheld | $ (4.3) | $ 0.1 | (4.4) |  |  |
Issuance of shares from Employee Stock Purchase Plans (in shares) |  | 0.3 |  |  |  |
Issuance of shares from Employee Stock Purchase Plan | 0.4 |  | 0.4 |  |  |
Share-based compensation expense for equity classified awards | 37.8 |  | 37.8 |  |  |
Net loss | (802.2) |  |  |  | (802.2) |
Other comprehensive (loss) income | $ (26.9) |  |  | (26.9) |  |
Ending balance (in shares) at Sep. 30, 2024 | 227.6 | 230.7 |  |  |  |
Ending balance at Sep. 30, 2024 | $ (949.7) | $ 2.3 | 2,672.0 | 33.4 | (3,626.4) | $ (31.0)
Ending balance (in shares) at Sep. 30, 2024 | 3.1 |  |  |  |  | 3.1
Beginning balance (in shares) at Jun. 30, 2024 |  | 228.7 |  |  |  |
Beginning balance at Jun. 30, 2024 | $ (756.2) | $ 2.3 | 2,661.1 | 51.2 | (3,439.8) | $ (31.0)
Beginning balance (in shares) at Jun. 30, 2024 |  |  |  |  |  | 3.1
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Exercise of stock options and release of stock awards, net of shares withheld (in shares) |  | 2.0 |  |  |  |
Exercise of stock options and release of stock awards, net of shares withheld | (0.9) |  | (0.9) |  |  |
Share-based compensation expense for equity classified awards | 11.8 |  | 11.8 |  |  |
Net loss | (186.6) |  |  |  | (186.6) |
Other comprehensive (loss) income | $ (17.8) |  |  | (17.8) |  |
Ending balance (in shares) at Sep. 30, 2024 | 227.6 | 230.7 |  |  |  |
Ending balance at Sep. 30, 2024 | $ (949.7) | $ 2.3 | $ 2,672.0 | $ 33.4 | $ (3,626.4) | $ (31.0)
Ending balance (in shares) at Sep. 30, 2024 | 3.1 |  |  |  |  | 3.1

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