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Stock-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) right $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 shares
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |
Unrecognized stock-based compensation expense | $ 143.1 |  |  |
Unrecognized stock-based compensation expense, weighted-average period recognition (in years) | 1 year 21 days |  |  |
Stock-based compensation expense | $ 101.7 | $ 82.6 | $ 90.3 |
Income tax benefit related to stock-based compensation expense | $ 25.1 | $ 20.5 | $ 34.3 |
Expiration period | 10 years |  |  |
Weighted-average per share fair value of option rights granted during the year (in dollars per share) | $ / shares | $ 116.41 | $ 90.86 | $ 77.14 |
Intrinsic value of exercised option rights | $ 1,184.0 | $ 704.2 | $ 955.8 |
Fair value of options vested | $ 43.2 | $ 38.6 | $ 31.3 |
Outstanding option rights (in shares) | shares | 4,039,729 | 4,485,249 | 4,646,313 | 5,163,709
Weighted average remaining term for options outstanding | 6 years 7 days | 6 years 1 month 2 days | 6 years 3 months 10 days |
Weighted average remaining term for options exercisable | 4 years 11 months 12 days | 5 years 3 days | 5 years 1 month 9 days |
Shares reserved for future grants of option rights restricted stock (in shares) | shares | 4,217,446 | 5,135,822 | 6,041,092 |
Employees |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |
Intrinsic value of exercised option rights | $ 285.8 | $ 190.2 | $ 255.5 |
Restricted Stock |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |
Weighted-average fair value of restricted stock granted during the year (in dollars per share) | $ / shares | $ 432.55 | $ 404.08 | $ 313.88 |
Time Shares |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |
Award vesting period | 3 years |  |  |
Performance shares |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |
Award vesting period | 3 years |  |  |
Service period required for vesting of grants | 3 years |  |  |
Stock Option |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |
Unrecognized stock-based compensation expense | $ 67.8 |  |  |
Unrecognized stock-based compensation expense, weighted-average period recognition (in years) | 1 year 1 month 6 days |  |  |
Vesting percentage | 33.00% |  |  |
Award vesting period | 3 years |  |  |
Restricted Stock |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |
Vesting percentage | 33.00% |  |  |
Award vesting period | 3 years |  |  |
Restricted Stock | Employees |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |
Unrecognized stock-based compensation expense | $ 73.6 |  |  |
Unrecognized stock-based compensation expense, weighted-average period recognition (in years) | 11 months 4 days |  |  |
Restricted Stock | Non-Employee Directors |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |
Unrecognized stock-based compensation expense | $ 1.7 |  |  |
Unrecognized stock-based compensation expense, weighted-average period recognition (in years) | 11 months 15 days |  |  |
Nonemployee Director Plan |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |
Number of appreciation rights, performance shares or performance units granted | right | 0 |  |  |
Outstanding option rights (in shares) | shares | 0 | 0 | 0 |
ASU 2016-09 |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |
Reduction of income tax provision | $ 65.2 | $ 43.4 | $ 86.5 |
2006 Employee Plan |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |
Number of shares authorized (in shares) | shares | 23,700,000 |  |  |
Number of appreciation rights, performance shares or performance units granted | right | 0 |  |  |
Nonemployee Director Plan |  |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |  |
Number of shares authorized (in shares) | shares | 200,000 |  |  |

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