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Employee Stock Purchase Plan, Stock Options and Warrants - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Compensation cost not yet recognized | $ 28.6 |  |
Compensation cost not yet recognized, period of recognition | 3 years |  |
Options granted in period (in shares) | 1,200,000 | 692,000 | 1,300,000
Fair value of options, net of forfeitures | $ 20.9 | $ 11.1 | $ 12.4
Options granted in period, weighted average grant date fair value (in dollars per share) | $ 16.78 | $ 16.05 | $ 9.57
2018 Incentive Plan |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares available for grant (in shares) | 1,714,323 |  |
2018 Incentive Plan | Stock Options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Option contractual life | 7 years |  |
2018 Incentive Plan | Stock Options | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 3 years |  |
2018 Incentive Plan | Stock Options | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Award vesting period | 5 years |  |
ESPP |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares available for grant (in shares) | 69,877 |  |
Purchase price for ESPP, percent of market price | 95.00% |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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