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Summary of Significant Accounting Policies (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) segment | Sep. 30, 2020 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Number of reportable segments | segment |  |  | 3 |
Advertising expense | $ 13.9 | $ 7.7 | $ 34.1 | $ 28.9
Capitalized internal-use software development costs | $ 9.5 | $ 8.8 | $ 29.0 | $ 31.7
Minimum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets, useful life |  |  | 2 years |
Maximum |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets, useful life |  |  | 5 years |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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