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Share-Based Compensation - Additional Information (Details) $ / shares in Units, $ in Millions | 12 Months Ended |  |  |  |  |  |  |
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Dec. 31, 2019 USD ($) period $ / shares shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 | Apr. 30, 2019 shares | Mar. 31, 2019 shares | Apr. 30, 2017 shares | Mar. 31, 2017 shares | Apr. 30, 2015 shares | Mar. 31, 2015 shares | Oct. 31, 2009 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of options exercised under stock option plans | $ | $ 512.0 | $ 526.6 | $ 379.9 |  |  |  |  |  |  |  |
Cash received from option exercises and employee stock purchase plans | $ | $ 272.8 | 236.6 | 415.5 |  |  |  |  |  |  |  |
Number of options vested and expected to vest | 5,200,000 |  |  |  |  |  |  |  |  |  |
Weighted average remaining contractual life of shares vested and expected to vest, years | 5 years 2 months 12 days |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value of shares vested and expected to vest | $ | $ 1,833.1 |  |  |  |  |  |  |  |  |  |
Options vested and expected to vest, weighted-average exercise price per share | $ / shares | $ 241.65 |  |  |  |  |  |  |  |  |  |
Share-based compensation charges, income tax effect | $ | $ 70.2 | 54.3 | 49.2 |  |  |  |  |  |  |  |
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options | $ | 109.7 |  |  |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total unrecognized compensation expense | $ | $ 493.6 |  |  |  |  |  |  |  |  |  |
Weighted average period unrecognized compensation expenses are expected to be recognized, years | 2 years 2 months 12 days |  |  |  |  |  |  |  |  |  |
Expected to vest (in shares) | 1,700,000 |  |  |  |  |  |  |  |  |  |
Aggregate intrinsic value | $ | $ 1,032.0 |  |  |  |  |  |  |  |  |  |
Canceled (shares) | 100,000 |  |  |  |  |  |  |  |  |  |
Vested in period, aggregate fair value | $ | $ 433.2 | $ 334.3 | $ 144.2 |  |  |  |  |  |  |  |
Restricted Stock Units (RSUs) | Employees |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 25.00% |  |  |  |  |  |  |  |  |  |
Share based vesting period | 4 years |  |  |  |  |  |  |  |  |  |
Annual Grant Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage vesting upon six months of service | 12.50% |  |  |  |  |  |  |  |  |  |
Percentage vesting per month after six months of service | 2.0833% |  |  |  |  |  |  |  |  |  |
Annual Grant Options | February Grant |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage vesting upon six months of service | 12.50% |  |  |  |  |  |  |  |  |  |
Percentage vesting per month after six months of service | 2.0833% |  |  |  |  |  |  |  |  |  |
Annual Grant Options | August Grant |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage vesting at the end of one month | 14.5833% |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage | 2.0833% |  |  |  |  |  |  |  |  |  |
New Hire Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage vesting upon one year of service | 25.00% |  |  |  |  |  |  |  |  |  |
Percentage vesting per month after one year | 2.0833% |  |  |  |  |  |  |  |  |  |
Employee Stock |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares were reserved for future issuance (shares) | 1,200,000 |  |  |  |  |  |  |  |  |  |
Minimum hours employed per week | 20 hours |  |  |  |  |  |  |  |  |  |
Minimum months employed per year | 5 months |  |  |  |  |  |  |  |  |  |
Maximum percentage of employees on stockholders to participate in ESPP | 5.00% |  |  |  |  |  |  |  |  |  |
Percentage of employee payroll deduction under the stock plan, maximum | 15.00% |  |  |  |  |  |  |  |  |  |
Duration for each offering period | 24 months |  |  |  |  |  |  |  |  |  |
Number of shorter purchase periods that each offering period is divided into | period | 4 |  |  |  |  |  |  |  |  |  |
Duration of each shorter offering period | 6 months |  |  |  |  |  |  |  |  |  |
Discount on fair market value on the offering date | 85.00% |  |  |  |  |  |  |  |  |  |
Discount on fair market value on the purchase date | 85.00% |  |  |  |  |  |  |  |  |  |
Period of look-back that could cause offering period to reset | 2 years |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  |  |  |  |  | 7,590,315 | 6,090,315 |  |  |
Employee stock purchase plan, shares issued | 200,000 | 200,000 | 200,000 |  |  |  |  |  |  |  |
Employee stock purchase plan, value of shares issued | $ | $ 56.4 | $ 46.8 | $ 38.3 |  |  |  |  |  |  |  |
Total unrecognized compensation expense | $ | $ 31.4 |  |  |  |  |  |  |  |  |  |
Weighted average period unrecognized compensation expenses are expected to be recognized, years | 1 year 4 months 24 days |  |  |  |  |  |  |  |  |  |
Nonvested Stock Option |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total unrecognized compensation expense | $ | $ 110.1 |  |  |  |  |  |  |  |  |  |
Weighted average period unrecognized compensation expenses are expected to be recognized, years | 2 years 6 months |  |  |  |  |  |  |  |  |  |
Initial RSU grants | Director |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  | 33.3333% |  |  |  |  |  |  |  |  |
2010 Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation, options, expiration term (in years) | 10 years |  |  |  |  |  |  |  |  |  |
Number of shares of common stock reserved for issuance (shares) |  |  |  |  | 28,450,000 | 24,450,000 |  |  |  |  |
Shares were reserved for future issuance (shares) | 5,900,000 |  |  |  |  |  |  |  |  |  |
2010 Plan | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares were reserved for future issuance (shares) | 2,600,000 |  |  |  |  |  |  |  |  |  |
2010 Plan | Annual Grant Options | February Grant |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share based vesting period | 4 years |  |  |  |  |  |  |  |  |  |
2010 Plan | Annual Grant Options | August Grant |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share based vesting period | 3 years 6 months |  |  |  |  |  |  |  |  |  |
2009 Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation, options, expiration term (in years) | 10 years |  |  |  |  |  |  |  |  |  |
Number of shares of common stock reserved for issuance (shares) |  |  |  |  |  |  |  |  | 4,365,000 | 3,465,000 |
2000 Equity Incentive Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation, options, expiration term (in years) | 10 years |  |  |  |  |  |  |  |  |  |
Minimum exercise price of NSOs, percentage of fair value | 85.00% |  |  |  |  |  |  |  |  |  |
2000 Non-Employee Directors' Stock Option Plan |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share-based compensation, options, expiration term (in years) | 10 years |  |  |  |  |  |  |  |  |  |
Number of shares of common stock reserved for issuance (shares) |  |  |  |  |  |  |  |  |  |  | 450,000
Shares were reserved for future issuance (shares) | 100,000 |  |  |  |  |  |  |  |  |  |
2000 Non-Employee Directors' Stock Option Plan | Annual Grant Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Share based vesting period |  |  |  | 1 year |  |  |  |  |  |  |
2000 Non-Employee Directors' Stock Option Plan | Initial Grant Options |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage vesting upon one year of service |  | 33.3333% |  |  |  |  |  |  |  |  |
Percentage vesting per month after one year |  | 2.7778% |  |  |  |  |  |  |  |  |
Stock options granted initial vesting period, years |  |  |  | 3 years |  |  |  |  |  |  |

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