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Share-Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 31, 2020 | May 31, 2018 | May 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Weighted-average fair values of stock options granted (in USD per share) | $ 45.67 | $ 41.74 | $ 43.42 |  |  |
Stock options exercised in period intrinsic value | $ 40.2 | $ 64.3 | $ 117.0 |  |  |
Cash received from stock option exercises | $ 23.5 | 27.3 | 29.5 |  |  |
ESPP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of common stock authorized for issuance (in shares) | 200,000 |  |  |  | 300,000 |
ESPP | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Discounted purchase price percentage of common stock authorized for issuance | 85.00% |  |  |  |  |
Stock options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Contractual term of stock options | 10 years |  |  |  |  |
Unrecognized expense | $ 86.2 |  |  |  |  |
Stock options | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period | 3 years |  |  |  |  |
Stock options | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period | 4 years |  |  |  |  |
RSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period | 4 years |  |  |  |  |
Total intrinsic value vested in period | $ 49.7 | $ 36.1 | $ 35.5 |  |  |
Unrecognized expense | 99.5 |  |  |  |  |
PRSUs |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Unrecognized expense | 17.0 |  |  |  |  |
Total fair value of PRSUs vested | $ 13.5 |  |  |  |  |
PRSUs | Minimum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period | 4 years |  |  |  |  |
PRSUs | Maximum |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Vesting period | 5 years |  |  |  |  |
2011 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of common stock authorized for issuance (in shares) | 0 |  |  |  |  | 21,000,000
2020 Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Number of common stock authorized for issuance (in shares) | 8,200,000 |  |  | 3,300,000 |  |

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