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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - SEC Schedule, 12-09, Allowance, Credit Loss [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of year | $ 6.1 | $ 6.3 | $ 5.9
Additions charged to cost and expenses | 8.1 | 4.5 | 4.8
Write-offs | (4.2) | (4.9) | (3.7)
Recoveries | 1.2 | 1.6 | 0.6
Other | (1.6) | (1.4) | (1.3)
Balance at end of year | $ 9.6 | $ 6.1 | $ 6.3

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- Definition Amount of increase (decrease) in valuation and qualifying accounts and reserves from adjustment. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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