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v3.21.2

Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) shares in Millions, $ in Millions | Total | Common Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income | Accumulated Deficit | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance at beginning of period (in shares) at Dec. 31, 2019 |  | 91.6 |  |  |  |
Balance at beginning of period at Dec. 31, 2019 | $ 882.6 | $ 0.1 | $ 1,675.9 | $ 2.3 | $ (695.7) | $ (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock under equity incentive plans (in shares) |  | 1.0 |  |  |  |
Issuance of common stock under equity incentive plans | 0.3 |  | 0.3 |  |  |
Issuance of common stock for Employee Stock Purchase Plan | 15.0 |  | 15.0 |  |  |
Equity component of 2025 Notes issuance, net of issuance costs | 289.4 |  | 289.4 |  |  |
Repurchase and conversions of Notes (in shares) |  | 3.4 |  |  |  |
Repurchase and conversions of Notes | 87.8 |  | 87.8 |  |  |
Share-based compensation expense | 85.3 |  | 85.3 |  |  |
Net income | 138.4 |  |  |  | 138.4 |
Other comprehensive income (loss), net of tax | 0.5 |  |  | 0.5 |  |
Balance at end of period (in shares) at Sep. 30, 2020 |  | 96.0 |  |  |  |
Balance at end of period at Sep. 30, 2020 | 1,499.3 | $ 0.1 | 2,153.7 | 2.8 | (557.3) | (100.0)
Balance at beginning of period (in shares) at Jun. 30, 2020 |  | 95.4 |  |  |  |
Balance at beginning of period at Jun. 30, 2020 | 1,353.9 | $ 0.1 | 2,079.8 | 3.5 | (629.5) | (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock under equity incentive plans (in shares) |  | 0.2 |  |  |  |
Issuance of common stock under equity incentive plans | 0.0 |  |  |  |  |
Issuance of common stock for Employee Stock Purchase Plan | 8.6 |  | 8.6 |  |  |
Repurchase and conversions of Notes (in shares) |  | 0.4 |  |  |  |
Repurchase and conversions of Notes | 34.6 |  | 34.6 |  |  |
Share-based compensation expense | 30.7 |  | 30.7 |  |  |
Net income | 72.2 |  |  |  | 72.2 |
Other comprehensive income (loss), net of tax | (0.7) |  |  | (0.7) |  |
Balance at end of period (in shares) at Sep. 30, 2020 |  | 96.0 |  |  |  |
Balance at end of period at Sep. 30, 2020 | 1,499.3 | $ 0.1 | 2,153.7 | 2.8 | (557.3) | (100.0)
Balance at beginning of period (in shares) at Dec. 31, 2020 |  | 96.1 |  |  |  |
Balance at beginning of period at Dec. 31, 2020 | 1,826.5 | $ 0.1 | 2,125.3 | 3.2 | (202.1) | (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock under equity incentive plans (in shares) |  | 0.7 |  |  |  |
Issuance of common stock for Employee Stock Purchase Plan | 20.3 |  | 20.3 |  |  |
Repurchase and conversions of Notes (in shares) |  | 0.2 |  |  |  |
Repurchase and conversions of Notes | 29.9 |  | 24.3 |  |  | 5.6
Benefit of note hedge upon conversions of 2023 Notes (in shares) |  | (0.1) |  |  |  |
Benefit of note hedge upon conversions of 2023 Notes | 0.0 |  | 65.1 |  |  | (65.1)
Share-based compensation expense | 87.1 |  | 87.1 |  |  |
Net income | 174.1 |  |  |  | 174.1 |
Other comprehensive income (loss), net of tax | (1.8) |  |  | (1.8) |  |
Balance at end of period (in shares) at Sep. 30, 2021 |  | 96.9 |  |  |  |
Balance at end of period at Sep. 30, 2021 | 2,136.1 | $ 0.1 | 2,322.1 | 1.4 | (28.0) | (159.5)
Balance at beginning of period (in shares) at Jun. 30, 2021 |  | 96.7 |  |  |  |
Balance at beginning of period at Jun. 30, 2021 | 1,997.6 | $ 0.1 | 2,193.6 | 2.8 | (98.9) | (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock under equity incentive plans (in shares) |  | 0.1 |  |  |  |
Issuance of common stock under equity incentive plans | 0.0 |  |  |  |  |
Issuance of common stock for Employee Stock Purchase Plan | 11.6 |  | 11.6 |  |  |
Repurchase and conversions of Notes (in shares) |  | 0.2 |  |  |  |
Repurchase and conversions of Notes | 29.9 |  | 24.3 |  |  | 5.6
Benefit of note hedge upon conversions of 2023 Notes (in shares) |  | (0.1) |  |  |  |
Benefit of note hedge upon conversions of 2023 Notes | 0.0 |  | 65.1 |  |  | (65.1)
Share-based compensation expense | 27.5 |  | 27.5 |  |  |
Net income | 70.9 |  |  |  | 70.9 |
Other comprehensive income (loss), net of tax | (1.4) |  |  | (1.4) |  |
Balance at end of period (in shares) at Sep. 30, 2021 |  | 96.9 |  |  |  |
Balance at end of period at Sep. 30, 2021 | $ 2,136.1 | $ 0.1 | $ 2,322.1 | $ 1.4 | $ (28.0) | $ (159.5)

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- Definition Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. 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(a)(3)(iii)(03) + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant