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Schedule II (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |  |
Valuation Allowances and Reserves, Beginning Balance |  | $ 1.5 | $ 1.7 | $ 1.5
Valuation Allowances and Reserves, Charged to Cost and Expense |  | 3.0 | 2.2 | 3.4
SEC Schedule, 12-09, Valuation Allowances and Reserves, Deduction | [1] | 1.9 | 2.4 | 3.2
Valuation Allowances and Reserves, Ending Balance |  | $ 2.6 | $ 1.5 | $ 1.7
[1] | Uncollectible accounts receivable written off, net of recoveries.

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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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