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Consolidated Statement Of Shareholders' Equity - USD ($) $ in Millions | Total | Preferred Stock | Common Stock | Treasury Stock | Paid-in Capital | Accumulated Deficit | Accumulated Other Comprehensive Loss | As Reported | As Reported Preferred Stock | As Reported Common Stock | As Reported Treasury Stock | As Reported Paid-in Capital | As Reported Accumulated Deficit | As Reported Accumulated Other Comprehensive Loss | New Revenue Standard Adjustment | New Revenue Standard Adjustment Accumulated Deficit
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1.9 | $ 1.9
Beginning balance (in shares) at Dec. 31, 2015 |  | 0 | 168,200,000 | 0 |  |  |  |  | 0 | 168,200,000 | 0 |  |  |  |  |
Beginning balance at Dec. 31, 2015 | $ 1,097.8 | $ 0.0 | $ 1.7 | $ 0.0 | $ 2,806.9 | $ (1,649.7) | $ (61.1) | $ 1,095.9 | $ 0.0 | $ 1.7 | $ 0.0 | $ 2,806.9 | $ (1,651.6) | $ (61.1) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | $ 425.1 |  |  |  |  | 425.1 |  | 424.4 |  |  |  |  |  |  |  |
Net income | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.7 |
Common stock issued for equity-based compensation (in shares) | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued for equity-based compensation | $ 0.0 |  |  |  | 0.0 |  |  |  |  |  |  |  |  |  |  |
Equity-based compensation expense | 33.2 |  |  |  | 33.2 |  |  |  |  |  |  |  |  |  |  |
Stock option exercises (in shares) |  |  | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option exercises | 7.4 |  |  |  | 7.4 |  |  |  |  |  |  |  |  |  |  |
Coworker Stock Purchase Plan (in shares) |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Coworker Stock Purchase Plan | 9.3 |  |  |  | 9.3 |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock (in shares) |  |  | (8,700,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock | (367.5) |  | $ (0.1) |  |  | (367.4) |  |  |  |  |  |  |  |  |  |
Dividends paid | (78.7) |  |  |  | 0.5 | (79.2) |  |  |  |  |  |  |  |  |  |
Foreign currency translation | (78.7) |  |  |  |  |  | (78.7) |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2016 |  | 0 | 160,300,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2016 | 1,047.9 | $ 0.0 | $ 1.6 | $ 0.0 | 2,857.3 | (1,671.2) | (139.8) |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 523.1 |  |  |  |  | 523.1 |  | $ 523.0 |  |  |  |  |  |  |  |
Net income | Accounting Standards Update 2014-09 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.1 |
Equity-based compensation expense | 37.9 |  |  |  | 37.9 |  |  |  |  |  |  |  |  |  |  |
Stock option exercises (in shares) |  |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option exercises | 13.0 |  |  |  | 13.0 |  |  |  |  |  |  |  |  |  |  |
Coworker Stock Purchase Plan (in shares) |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Coworker Stock Purchase Plan | 10.3 |  |  |  | 10.3 |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock (in shares) |  |  | (8,900,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock | (534.0) |  | $ (0.1) |  |  | (533.9) |  |  |  |  |  |  |  |  |  |
Dividends paid | (106.9) |  |  |  | 0.7 | (107.6) |  |  |  |  |  |  |  |  |  |
Incentive compensation plan stock withheld for taxes (in shares) |  |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |
Incentive compensation plan stock withheld for taxes | (49.6) |  |  |  | (7.6) | (42.0) |  |  |  |  |  |  |  |  |  |
Foreign currency translation | 43.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized loss from hedge accounting | 0.2 |  |  |  |  |  | 0.2 |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2017 |  | 0 | 153,100,000 | 100,000 |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2017 | 985.6 | $ 0.0 | $ 1.5 | $ 0.0 | 2,911.6 | (1,831.6) | (95.9) |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income | 643.0 |  |  |  |  | 643.0 |  |  |  |  |  |  |  |  |  |
Equity-based compensation expense | $ 36.5 |  |  |  | 36.5 |  |  |  |  |  |  |  |  |  |  |
Stock option exercises (in shares) | 935,250 |  | 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option exercises | $ 28.6 |  |  |  | 28.6 |  |  |  |  |  |  |  |  |  |  |
Coworker Stock Purchase Plan (in shares) |  |  | 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Coworker Stock Purchase Plan | 11.8 |  |  |  | 11.8 |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock (in shares) |  |  | (6,300,000) |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchases of common stock | (522.3) |  |  |  |  | (522.3) |  |  |  |  |  |  |  |  |  |
Dividends paid | (139.4) |  |  |  | 0.8 | (140.2) |  |  |  |  |  |  |  |  |  |
Incentive compensation plan stock withheld for taxes (in shares) |  |  |  | (100,000) |  |  |  |  |  |  |  |  |  |  |  |
Incentive compensation plan stock withheld for taxes | (33.9) |  |  |  | 7.6 | (41.5) |  |  |  |  |  |  |  |  |  |
Foreign currency translation | (32.7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized loss from hedge accounting | (2.0) |  |  |  |  |  | (2.0) |  |  |  |  |  |  |  |  |
Ending balance (in shares) at Dec. 31, 2018 |  | 0 | 147,700,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2018 | $ 975.2 | $ 0.0 | $ 1.5 | $ 0.0 | $ 2,996.9 | $ (1,892.6) | $ (130.6) |  |  |  |  |  |  |  |  |

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