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CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Unaudited) - USD ($) shares in Millions, $ in Millions | Total | Common Stock | Additional Paid-In Capital | Accumulated Deficit | Accumulated Other Comprehensive Income (Loss) | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2017 |  | 28.3 |  |  |  |
Beginning balance at Dec. 31, 2017 | $ 510.4 | $ 0.3 | $ 1,763.1 | $ (462.4) | $ (98.6) | $ (692.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | (35.8) |  |  | (35.8) |  |
Other comprehensive loss | (2.6) |  |  |  | (2.6) |
Net settlement on vesting of equity awards, shares |  | 0.1 |  |  |  |
Net settlement on vesting of equity awards | (1.1) |  | (1.1) |  |  |
Stock-based compensation charges | 9.9 |  | 9.9 |  |  |
Employee stock purchase plan | 1.4 |  | 1.4 |  |  |
Exercise of stock options, shares |  | 0.1 |  |  |  |
Exercise of stock options | 0.5 |  | 0.5 |  |  |
Ending balance at Sep. 30, 2018 | 554.3 | $ 0.3 | 1,773.8 | (426.6) | (101.2) | (692.0)
Ending balance (in shares) at Sep. 30, 2018 |  | 28.5 |  |  |  |
Beginning balance (in shares) at Jun. 30, 2018 |  | 28.5 |  |  |  |
Beginning balance at Jun. 30, 2018 | 495.3 | $ 0.3 | 1,770.0 | (472.8) | (110.2) | (692.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | (46.2) |  |  | (46.2) |  |
Other comprehensive loss | 9.0 |  |  |  | 9.0 |
Stock-based compensation charges | 3.3 |  | 3.3 |  |  |
Employee stock purchase plan | 0.5 |  | 0.5 |  |  |
Ending balance at Sep. 30, 2018 | 554.3 | $ 0.3 | 1,773.8 | (426.6) | (101.2) | (692.0)
Ending balance (in shares) at Sep. 30, 2018 |  | 28.5 |  |  |  |
Beginning balance (in shares) at Dec. 31, 2018 |  | 28.5 |  |  |  |
Beginning balance at Dec. 31, 2018 | 572.7 | $ 0.3 | 1,777.9 | (391.1) | (122.4) | (692.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | (12.4) |  |  | (12.4) |  |
Other comprehensive loss | 4.2 |  |  |  | 4.2 |
Net settlement on vesting of equity awards, shares |  | 0.3 |  |  |  |
Net settlement on vesting of equity awards | (3.7) |  | (3.7) |  |  |
Stock-based compensation charges | 12.5 |  | 12.5 |  |  |
Employee stock purchase plan | 1.8 |  | 1.8 |  |  |
Exercise of stock options, shares |  | 0.0 |  |  |  |
Exercise of stock options | 0.7 |  | 0.7 |  |  |
Ending balance at Sep. 30, 2019 | 593.0 | $ 0.3 | 1,789.2 | (386.3) | (118.2) | (692.0)
Ending balance (in shares) at Sep. 30, 2019 |  | 28.8 |  |  |  |
Beginning balance (in shares) at Jun. 30, 2019 |  | 28.7 |  |  |  |
Beginning balance at Jun. 30, 2019 | 583.7 | $ 0.3 | 1,785.8 | (395.7) | (114.7) | (692.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | (9.4) |  |  | (9.4) |  |
Other comprehensive loss | (3.5) |  |  |  | (3.5) |
Net settlement on vesting of equity awards, shares |  | 0.1 |  |  |  |
Net settlement on vesting of equity awards | (1.7) |  | (1.7) |  |  |
Stock-based compensation charges | 4.3 |  | 4.3 |  |  |
Employee stock purchase plan | 0.6 |  | 0.6 |  |  |
Exercise of stock options, shares |  | 0.0 |  |  |  |
Exercise of stock options | 0.2 |  | 0.2 |  |  |
Ending balance at Sep. 30, 2019 | 593.0 | $ 0.3 | $ 1,789.2 | (386.3) | $ (118.2) | $ (692.0)
Ending balance (in shares) at Sep. 30, 2019 |  | 28.8 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Adoption of new accounting pronouncement (Note 2) | $ (7.6) |  |  | $ (7.6) |  |

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