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v3.20.4

Schedule II - Valuation and Qualifying Accounts (Details) - 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 period | $ 16.4 | $ 18.0 | $ 21.4
Charged to costs and expenses | 0.7 | 0.1 | (2.3)
Deductions | (0.9) | (1.7) | (1.1)
Balance at end of period | 16.2 | 16.4 | 18.0
Deferred tax asset valuation allowance |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | 15.9 | 16.0 | 20.9
Charged to costs and expenses | 0.0 | 0.0 | (3.0)
Deductions | (0.8) | (0.1) | (1.9)
Balance at end of period | 15.1 | 15.9 | 16.0
Allowance for doubtful accounts |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance at beginning of period | 0.5 | 2.0 | 0.5
Charged to costs and expenses | 0.7 | 0.1 | 0.7
Deductions | (0.1) | (1.6) | 0.8
Balance at end of period | $ 1.1 | $ 0.5 | $ 2.0

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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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