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Equity Awards (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Net cash proceeds related to stock options exercised |  | $ 8.6
Payments related to stock option exercised | $ 1.8 |
Aggregate intrinsic value of stock options exercised | 17.4 | $ 11.3
Stock-based compensation cost which has not yet been recognized | $ 24.7 |
Stock-based compensation cost recognized period, in months | 23 months |
Restricted stock awarded subject to performance condition (in shares) | 313,000 |
2018 Plan |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Maximum term of the awards granted under the Plan | 10 years |
Additional shares authorized for grants | 700,000 |

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