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Schedule II - Valuation and Qualifying Accounts (Details) - Allowance for Doubtful Accounts - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Allowance for doubtful accounts (deducted from accounts receivable): |  |  |
Balance at Beginning of Period | $ 13.7 | $ 22.0 | $ 22.8
Additions Charged to Costs and Expenses | (1.6) | (5.1) | 3.1
Deductions | (0.3) | (3.2) | (3.9)
Balance at End of Period | $ 11.8 | $ 13.7 | $ 22.0

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