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Equity Awards (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | 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 | $ 1.2 | $ (1.8) | $ 8.6
Aggregate intrinsic value of stock options exercised | 2.0 | 17.4 | 11.3
Stock-based compensation cost which has not yet been recognized | $ 30.0 |  |
Stock-based compensation cost recognized period, in months | 1 year 10 months 24 days |  |
Restricted stock awarded subject to performance condition (in shares) | 308,000 |  |
Tax windfall related to share-based payment arrangements | $ 2.8 | $ 4.0 | $ 3.5
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 (in shares) | 700,000 |  |

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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=120381028&loc=d3e5070-113901 + Details
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