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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions | Total | Common Stock | Treasury Stock | Additional Paid-in Capital | Retained Earnings | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2018 |  | 215.2 | 7.5 |  |  |
Beginning balance at Dec. 31, 2018 | $ 3,140.4 | $ 215.2 | $ (1,015.4) | $ 1,384.4 | $ 2,694.7 | $ (138.5)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 1,046.9 |  |  |  | 1,046.9 |
Other comprehensive income (loss), net of tax | (17.5) |  |  |  |  | (17.5)
Common stock issued under equity plans (in shares) |  | 2.9 |  |  |  |
Common stock issued under equity plans | 160.5 | $ 2.9 |  | 157.6 |  |
Stock-based compensation expense | 81.3 |  |  | 81.3 |  |
Purchases of treasury stock (in shares) |  |  | 1.5 |  |  |
Purchases of treasury stock | (263.3) |  | $ (263.3) |  |  |
Ending balance (in shares) at Dec. 31, 2019 |  | 218.1 | 9.0 |  |  |
Ending balance at Dec. 31, 2019 | 4,148.3 | $ 218.1 | $ (1,278.7) | 1,623.3 | 3,741.6 | (156.0)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 823.4 |  |  |  | 823.4 |
Other comprehensive income (loss), net of tax | (5.1) |  |  |  |  | (5.1)
Common stock issued under equity plans (in shares) |  | 4.5 |  |  |  |
Common stock issued under equity plans | 140.5 | $ 4.5 |  | 136.0 |  |
Stock-based compensation expense | 92.6 |  |  | 92.6 |  |
Purchases of treasury stock (in shares) |  |  | 3.1 |  |  |
Purchases of treasury stock | (625.4) |  | $ (625.4) |  |  |
Stock issued to effect stock split (in shares) |  | 413.8 |  |  |  |
Stock issued to effect stock split | 0.0 | $ 413.8 |  | (413.8) |  |
Ending balance (in shares) at Dec. 31, 2020 |  | 636.4 | 12.1 |  |  |
Ending balance at Dec. 31, 2020 | 4,574.3 | $ 636.4 | $ (1,904.1) | 1,438.1 | 4,565.0 | (161.1)
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income | 1,503.1 |  |  |  | 1,503.1 |
Other comprehensive income (loss), net of tax | 3.4 |  |  |  |  | 3.4
Common stock issued under equity plans (in shares) |  | 5.6 |  |  |  |
Common stock issued under equity plans | 158.6 | $ 5.6 |  | 153.0 |  |
Stock-based compensation expense | 109.3 |  |  | 109.3 |  |
Purchases of treasury stock (in shares) |  |  | 5.8 |  |  |
Purchases of treasury stock | (512.8) |  | $ (512.8) |  |  |
Ending balance (in shares) at Dec. 31, 2021 |  | 642.0 | 17.9 |  |  |
Ending balance at Dec. 31, 2021 | $ 5,835.9 | $ 642.0 | $ (2,416.9) | $ 1,700.4 | $ 6,068.1 | $ (157.7)

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