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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions | Total | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2015 | $ 1,006.7 | $ 0.9 | $ 1,449.9 | $ (317.9) | $ (126.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net earnings (loss) | (42.3) |  |  | (42.3) |
Other Comprehensive Income (Loss), Net of Tax | (5.9) |  |  |  | (5.9)
Stock-based compensation expense | 21.5 |  | 21.5 |  |
Tax on restricted stock unit vesting | (1.5) |  | (1.5) |  |
Purchase of convertible note hedges | (44.5) |  |  |  |
Issuance of warrants | 39.1 |  | 39.1 |  |
Equity component of the convertible notes issuance, net | 35.3 |  | 35.3 |  |
Balance at Dec. 31, 2016 | 1,008.4 | 0.9 | 1,499.8 | (360.2) | (132.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net earnings (loss) | 68.3 |  |  | 68.3 |
Other Comprehensive Income (Loss), Net of Tax | 32.1 |  |  |  | 32.1
Stock-based compensation expense | 25.1 |  | 25.1 |  |
Tax on restricted stock unit vesting | (5.1) |  | (5.1) |  |
Common stock issued for exercise of stock options | 3.3 |  | 3.3 |  |
Balance at Dec. 31, 2017 | 1,132.1 | 0.9 | 1,523.1 | (291.9) | (100.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Net earnings (loss) | 67.7 |  |  |  |
Other Comprehensive Income (Loss), Net of Tax | (11.0) |  |  |  | (11.0)
Stock-based compensation expense | 27.0 |  | 27.0 |  |
Tax on restricted stock unit vesting | (4.7) |  | (4.7) |  |
Common stock issued for exercise of stock options | 0.5 |  | 0.5 |  |
Balance at Dec. 31, 2018 | $ 1,211.6 | $ 0.9 | $ 1,545.9 | $ (224.2) | $ (111.0)

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