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Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) shares in Millions, $ in Millions | Total | Common Stock | Paid-in Capital | Accumulated Deficit | Accumulated Other Comprehensive Loss | Cumulative Effect, Period of Adoption, Adjustment | Cumulative Effect, Period of Adoption, Adjustment Accumulated Deficit
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2019 |  | 143.0 |  |  |  |  |
Beginning balance at Dec. 31, 2019 | $ 960.3 | $ 1.4 | $ 3,095.3 | $ (2,018.6) | $ (117.8) | $ 0.5 | $ 0.5
Shareholders' Equity (Deficit) [Roll Forward] |  |  |  |  |  |  |
Net income | 357.0 |  |  | 357.0 |  |  |
Equity-based compensation expense | 14.4 |  | 14.4 |  |  |  |
Stock option exercises (in shares) |  | 0.7 |  |  |  |  |
Stock option exercises | 19.8 |  | 19.8 |  |  |  |
Coworker Stock Purchase Plan | 8.3 |  | 8.3 |  |  |  |
Repurchases of common stock (in shares) |  | (1.1) |  |  |  |  |
Repurchases of common stock | (140.8) | $ 0.0 |  | (140.8) |  |  |
Dividends paid | (108.2) |  | 0.5 | (108.7) |  |  |
Incentive compensation plan stock withheld for taxes | (21.9) |  |  | (21.9) |  |  |
Unrealized loss from hedge accounting | (0.2) |  |  |  | (0.2) |  |
Reclassification of hedge accounting loss to net income | 2.5 |  |  |  | 2.5 |  |
Foreign currency translation | (36.1) |  |  |  | (36.1) |  |
Ending balance (in shares) at Jun. 30, 2020 |  | 142.6 |  |  |  |  |
Ending balance at Jun. 30, 2020 | 1,055.6 | $ 1.4 | 3,138.3 | (1,932.5) | (151.6) |  |
Beginning balance (in shares) at Dec. 31, 2019 |  | 143.0 |  |  |  |  |
Beginning balance at Dec. 31, 2019 | 960.3 | $ 1.4 | 3,095.3 | (2,018.6) | (117.8) | 0.5 | 0.5
Ending balance (in shares) at Dec. 31, 2020 |  | 141.9 |  |  |  |  |
Ending balance at Dec. 31, 2020 | $ 1,297.1 | $ 1.4 | 3,204.9 | (1,813.4) | (95.8) | 19.2 | 19.2
Shareholders' Equity (Deficit) [Roll Forward] |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201912Member |  |  |  |  |  |
Beginning balance (in shares) at Mar. 31, 2020 |  | 142.3 |  |  |  |  |
Beginning balance at Mar. 31, 2020 | $ 889.7 | $ 1.4 | 3,114.9 | (2,067.3) | (159.3) |  |
Shareholders' Equity (Deficit) [Roll Forward] |  |  |  |  |  |  |
Net income | 189.1 |  |  | 189.1 |  |  |
Equity-based compensation expense | 5.6 |  | 5.6 |  |  |  |
Stock option exercises (in shares) |  | 0.3 |  |  |  |  |
Stock option exercises | 12.7 |  | 12.7 |  |  |  |
Coworker Stock Purchase Plan | 4.8 |  | 4.8 |  |  |  |
Dividends paid | (54.0) |  | 0.3 | (54.3) |  |  |
Unrealized loss from hedge accounting | 0.0 |  |  |  |  |  |
Reclassification of hedge accounting loss to net income | 1.4 |  |  |  | 1.4 |  |
Foreign currency translation | 6.3 |  |  |  | 6.3 |  |
Ending balance (in shares) at Jun. 30, 2020 |  | 142.6 |  |  |  |  |
Ending balance at Jun. 30, 2020 | 1,055.6 | $ 1.4 | 3,138.3 | (1,932.5) | (151.6) |  |
Beginning balance (in shares) at Dec. 31, 2020 |  | 141.9 |  |  |  |  |
Beginning balance at Dec. 31, 2020 | 1,297.1 | $ 1.4 | 3,204.9 | (1,813.4) | (95.8) | $ 19.2 | $ 19.2
Shareholders' Equity (Deficit) [Roll Forward] |  |  |  |  |  |  |
Net income | 506.7 |  |  | 506.7 |  |  |
Equity-based compensation expense | 36.4 |  | 36.4 |  |  |  |
Stock option exercises (in shares) |  | 0.9 |  |  |  |  |
Stock option exercises | 41.8 |  | 41.8 |  |  |  |
Coworker Stock Purchase Plan (in shares) |  | 0.1 |  |  |  |  |
Coworker Stock Purchase Plan | 10.4 |  | 10.4 |  |  |  |
Repurchases of common stock (in shares) |  | (4.6) |  |  |  |  |
Repurchases of common stock | (735.3) |  |  | (735.3) |  |  |
Dividends paid | (112.3) |  | 0.6 | (112.9) |  |  |
Incentive compensation plan stock withheld for taxes | (27.8) |  |  | (27.8) |  |  |
Unrealized loss from hedge accounting | 0.0 |  |  |  |  |  |
Reclassification of hedge accounting loss to net income | 1.0 |  |  |  | 1.0 |  |
Foreign currency translation | 11.6 |  |  |  | 11.6 |  |
Ending balance (in shares) at Jun. 30, 2021 |  | 138.3 |  |  |  |  |
Ending balance at Jun. 30, 2021 | 1,048.8 | $ 1.4 | 3,294.1 | (2,163.5) | (83.2) |  |
Beginning balance (in shares) at Mar. 31, 2021 |  | 140.4 |  |  |  |  |
Beginning balance at Mar. 31, 2021 | 1,170.3 | $ 1.4 | 3,262.6 | (2,004.6) | (89.1) |  |
Shareholders' Equity (Deficit) [Roll Forward] |  |  |  |  |  |  |
Net income | 274.1 |  |  | 274.1 |  |  |
Equity-based compensation expense | 20.6 |  | 20.6 |  |  |  |
Stock option exercises | 4.1 |  | 4.1 |  |  |  |
Coworker Stock Purchase Plan (in shares) |  | 0.1 |  |  |  |  |
Coworker Stock Purchase Plan | 6.5 |  | 6.5 |  |  |  |
Repurchases of common stock (in shares) |  | (2.2) |  |  |  |  |
Repurchases of common stock | (376.9) |  |  | (376.9) |  |  |
Dividends paid | (55.8) |  | 0.3 | (56.1) |  |  |
Unrealized loss from hedge accounting | 0.0 |  |  |  |  |  |
Reclassification of hedge accounting loss to net income | 0.6 |  |  |  | 0.6 |  |
Foreign currency translation | 5.3 |  |  |  | 5.3 |  |
Ending balance (in shares) at Jun. 30, 2021 |  | 138.3 |  |  |  |  |
Ending balance at Jun. 30, 2021 | $ 1,048.8 | $ 1.4 | $ 3,294.1 | $ (2,163.5) | $ (83.2) |  |

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