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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY - USD ($) shares in Millions, $ in Millions | Total | Common stock and additional paid-in capital | Accumulated other comprehensive loss | Retained earnings (Accumulated deficit)
--- | --- | --- | --- | ---
Balance (in shares) at Jan. 31, 2015 |  | 227.0 |  |
Beginning Balance at Jan. 31, 2015 | $ 2,219.2 | $ 1,773.1 | $ (53.3) | $ 499.4
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Common shares issued under stock plans (in shares) |  | 5.9 |  |
Common shares issued under stock plans | 59.2 | $ 59.2 |  |
Stock-based compensation expense | 197.2 | 197.2 |  |
Tax benefits from employee stock plans | 0.3 | $ 0.3 |  |
Net loss | (330.5) |  |  | (330.5)
Other comprehensive income (loss) | (67.8) |  | (67.8) |
Repurchase and retirement of common shares (in shares) |  | (8.5) |  |
Repurchase and retirement of common shares | (458.0) | $ (208.3) |  | (249.7)
Balance (in shares) at Jan. 31, 2016 |  | 224.4 |  |
Ending Balance at Jan. 31, 2016 | 1,619.6 | $ 1,821.5 | (121.1) | (80.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Common shares issued under stock plans (in shares) |  | 5.6 |  |
Common shares issued under stock plans | 43.4 | $ 43.4 |  |
Stock-based compensation expense | 221.8 | $ 221.8 |  |
Net loss | (582.1) |  |  | (582.1)
Other comprehensive income (loss) | (57.4) |  | (57.4) |
Repurchase and retirement of common shares (in shares) |  | (9.7) |  |
Repurchase and retirement of common shares | (631.6) | $ (217.3) |  | (414.3)
Cumulative effect of accounting changes | $ 119.9 | $ 6.9 |  | 113.0
Balance (in shares) at Jan. 31, 2017 | 220.3 | 220.3 |  |
Ending Balance at Jan. 31, 2017 | $ 733.6 | $ 1,876.3 | (178.5) | (964.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Common shares issued under stock plans (in shares) |  | 4.9 |  |
Common shares issued under stock plans | (48.7) | $ (48.7) |  |
Stock-based compensation expense | 261.4 | $ 261.4 |  |
Net loss | (566.9) |  |  | (566.9)
Other comprehensive income (loss) | 54.7 |  | 54.7 |
Repurchase and retirement of common shares (in shares) |  | (6.9) |  |
Repurchase and retirement of common shares | $ (690.1) | $ (136.3) |  | (553.8)
Balance (in shares) at Jan. 31, 2018 | 218.3 | 218.3 |  |
Ending Balance at Jan. 31, 2018 | $ (256.0) | $ 1,952.7 | $ (123.8) | $ (2,084.9)

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