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Summary of Significant Accounting Policies, Revenue Recognition (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Revenue Recognition [Abstract] |  |  |
Sales returns | $ 49.5 | $ 52.2 | $ 52.0
Allowance for Product Returns [Member] |  |  |
Revenue Recognition [Abstract] |  |  |
Accrued reserve | $ 4.0 | $ 3.9 |

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- Definition The aggregate refunds recognized during an accounting period due to goods returned by customers (other than under warranty provisions). Returns are a deduction from gross revenue in arriving at net revenue. + References No definition available. + Details
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- Definition Amount of valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column B)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09(Column E)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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