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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 |  |  |
Valuation and Qualifying Accounts |  |  |
Balance at beginning of period | $ 33.5 | $ 23.0 | $ 23.6
Charged to cost and expenses | 1.2 | 13.0 | 1.8
Additions (Deductions) | (1.1) | (2.5) | (2.4)
Balance at end of period | 33.6 | 33.5 | 23.0
Valuation allowance on deferred tax assets |  |  |
Valuation and Qualifying Accounts |  |  |
Balance at beginning of period | 34.7 | 39.6 | 37.2
Charged to cost and expenses | 0.2 | (3.8) | 2.5
Additions (Deductions) | 0.3 | (1.1) | (0.1)
Balance at end of period | $ 35.2 | $ 34.7 | $ 39.6

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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=26873400&loc=d3e24092-122690 + Details
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