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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' DEFICIT - USD ($) $ in Millions | Total | Common stock: | Additional paid-in capital: | Accumulated loss: | Treasury stock: | Accumulated other comprehensive loss:
--- | --- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2014 |  | $ 1.0 | $ 743.2 | $ (470.7) |  | $ (94.4)
Change in the number of shares of Class A common stock outstanding [Roll Forward] |  |  |  |  |  |
Issuances and purchases of Class A common stock |  | 0.0 |  |  |  |
Issuance of Class A common stock in connection with employee stock purchase plan |  |  | 1.6 |  |  |
Net redemption of Class A common stock in connection with stock options and RSUs |  |  | (2.5) |  |  |
Stock-based compensation |  |  | 25.4 |  |  |
Tax effect from employee stock options and RSUs |  |  | (1.8) |  |  |
Net loss |  |  |  | (1,394.3) |  |
Other comprehensive income (loss) | $ (127.8) |  |  |  |  | (127.8)
Ending balance at Dec. 31, 2015 | (1,495.5) | 1.0 | 765.9 | (1,865.0) | $ (175.2) | (222.2)
Change in the number of shares of Class A common stock outstanding [Roll Forward] |  |  |  |  |  |
Issuances and purchases of Class A common stock |  | 0.0 |  |  |  |
Issuance of Class A common stock in connection with employee stock purchase plan |  |  | 0.0 |  |  |
Net redemption of Class A common stock in connection with stock options and RSUs |  |  | (6.1) |  |  |
Stock-based compensation |  |  | 33.7 |  |  |
Tax effect from employee stock options and RSUs |  |  | (2.7) |  |  |
Net loss |  |  |  | (353.7) |  |
Other comprehensive income (loss) | (111.4) |  |  |  |  | (111.4)
Ending balance at Dec. 31, 2016 | (1,935.7) | 1.0 | 790.8 | (2,218.7) | (175.2) | (333.6)
Change in the number of shares of Class A common stock outstanding [Roll Forward] |  |  |  |  |  |
Issuances and purchases of Class A common stock |  | 0.1 |  |  |  |
Issuance of Class A common stock in connection with employee stock purchase plan |  |  | 0.8 |  |  |
Net redemption of Class A common stock in connection with stock options and RSUs |  |  | (7.1) |  |  |
Stock-based compensation |  |  | 23.3 |  |  |
Tax effect from employee stock options and RSUs |  |  | 0.0 |  |  |
Net loss |  |  |  | (242.3) |  |
Other comprehensive income (loss) | 133.9 |  |  |  |  | 133.9
Ending balance at Dec. 31, 2017 | $ (2,027.0) | $ 1.1 | $ 807.8 | $ (2,461.0) | $ (175.2) | $ (199.7)

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