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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Allowance for doubtful accounts: |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance Beginning of Year | $ 4.0 | $ 3.6 | $ 3.5
Charged to Expense | 2.1 | 3.0 | 1.8
Deductions | (1.7) | (2.6) | (1.7)
Balance End of Year | 4.4 | 4.0 | 3.6
Deferred income tax asset valuation allowance: |  |  |
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward] |  |  |
Balance Beginning of Year | 0.2 | 0.2 | 0.4
Additions | 0.0 | 0.0 | 0.0
Deductions | 0.0 | 0.0 | (0.2)
Balance End of Year | $ 0.2 | $ 0.2 | $ 0.2

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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) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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