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Consolidated Statement of Shareholders' Equity (Unaudited) - 9 months ended Sep. 30, 2018 - USD ($) shares in Millions, $ in Millions | Total | Preferred Stock | Common Stock | Treasury Stock | Paid-in Capital | Accumulated Deficit | Accumulated Other Comprehensive Loss
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2017 |  |  | 0.0 | 153.1 | 0.1 |  |  |
Beginning balance at Dec. 31, 2017 | $ 982.9 |  | $ 0.0 | $ 1.5 | $ 0.0 | $ 2,911.6 | $ (1,834.3) | $ (95.9)
Cumulative adjustment upon adoption of ASC 606 at Dec. 31, 2017 | 2.7 |  |  |  |  |  | 2.7 |
Balance as of December 31, 2017 (as adjusted) at Dec. 31, 2017 | 985.6 |  | $ 0.0 | $ 1.5 | $ 0.0 | 2,911.6 | (1,831.6) | (95.9)
Shareholders' Equity (Deficit) [Roll Forward] |  |  |  |  |  |  |  |
Net income | 483.7 |  |  |  |  |  | 483.7 |
Equity-based compensation expense | 26.0 |  |  |  |  | 26.0 |  |
Stock option exercises (in shares) |  |  |  | 0.7 |  |  |  |
Stock option exercises | 24.4 |  |  |  |  | 24.4 |  |
Coworker Stock Purchase Plan (in shares) |  |  |  | 0.1 |  |  |  |
Coworker Stock Purchase Plan | 8.4 |  |  |  |  | 8.4 |  |
Repurchases of common stock (in shares) |  |  |  | (3.0) |  |  |  |
Repurchases of common stock | (232.5) |  |  |  |  |  | (232.5) |
Dividends paid | (95.5) |  |  |  |  | 0.5 | (96.0) |
Incentive compensation plan shares withheld for taxes (in shares) |  |  |  |  | (0.1) |  |  |
Incentive compensation plan stock withheld for taxes | (27.1) |  |  |  |  |  | (27.1) |
Foreign currency translation | (17.9) | [1] |  |  |  |  |  | (17.9)
Unrealized gain from hedge accounting | 5.6 |  |  |  |  |  |  | 5.6
Ending balance (in shares) at Sep. 30, 2018 |  |  | 0.0 | 150.9 | 0.0 |  |  |
Ending balance at Sep. 30, 2018 | $ 1,160.7 |  | $ 0.0 | $ 1.5 | $ 0.0 | $ 2,970.9 | $ (1,703.5) | $ (108.2)
[1] | Net of tax expense of $0.1 million and tax expense of $0.3 million for the three months ended September 30, 2018 and 2017, respectively, and net of tax benefit of $0.1 million and tax expense of $0.3 million for the nine months ended September 30, 2018 and 2017, respectively.

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