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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' (DEFICIT) EQUITY - USD ($) $ in Millions | Total | Common stock: | Additional paid-in capital: | Accumulated losses: | Treasury stock: | Accumulated other comprehensive (loss) income:
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2012 |  | $ 1.0 | $ 715.9 | $ (206.2) | $ (142.9) | $ (3.0)
Change in the number of shares of Class A common stock outstanding [Roll Forward] |  |  |  |  |  |
Issuance of Class A common stock in connection with employee stock purchase plan |  | 0.0 | 0.7 |  |  |
Net redemption of Class A common stock in connection with stock options and RSUs |  | 0.0 | (0.9) |  |  |
Purchases of Class A common stock |  | 0.0 |  |  | (2.8) |
Stock-based compensation |  |  | 21.8 |  |  |
Tax effect from employee stock options and RSUs |  |  | 0.3 |  |  |
Net loss |  |  |  | (30.2) |  |
Other comprehensive (loss) income | $ 21.3 |  |  |  |  | 21.3
Ending balance at Dec. 31, 2013 | 375.0 | 1.0 | 737.8 | (236.4) | (145.7) | 18.3
Change in the number of shares of Class A common stock outstanding [Roll Forward] |  |  |  |  |  |
Issuance of Class A common stock in connection with employee stock purchase plan |  | 0.0 | 1.6 |  |  |
Net redemption of Class A common stock in connection with stock options and RSUs |  | 0.0 | (20.6) |  |  |
Purchases of Class A common stock |  | 0.0 |  |  | (29.5) |
Stock-based compensation |  |  | 24.1 |  |  |
Tax effect from employee stock options and RSUs |  |  | 0.3 |  |  |
Net loss |  |  |  | (234.3) |  |
Other comprehensive (loss) income | (112.7) |  |  |  |  | (112.7)
Ending balance at Dec. 31, 2014 | 3.9 | 1.0 | 743.2 | (470.7) | (175.2) | (94.4)
Change in the number of shares of Class A common stock outstanding [Roll Forward] |  |  |  |  |  |
Issuance of Class A common stock in connection with employee stock purchase plan |  | 0.0 | 1.6 |  |  |
Net redemption of Class A common stock in connection with stock options and RSUs |  | 0.0 | (2.5) |  |  |
Purchases of Class A common stock |  | 0.0 |  |  | 0.0 |
Stock-based compensation |  |  | 25.4 |  |  |
Tax effect from employee stock options and RSUs |  |  | (1.8) |  |  |
Net loss |  |  |  | (1,394.3) |  |
Other comprehensive (loss) income | (127.8) |  |  |  |  | (127.8)
Ending balance at Dec. 31, 2015 | $ (1,495.5) | $ 1.0 | $ 765.9 | $ (1,865.0) | $ (175.2) | $ (222.2)

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