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Schedule II - Valuation And Qualifying Accounts Schedule II - Valuation And Qualifying Accounts (Tables) | 12 Months Ended
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Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Summary of Valuation Allowance | SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS ($ in millions)
Classification | Balance at Beginning of Period (a) |  | Charged to Costs & Expenses |  | Impact of Currency |  | Charged to Other Accounts (b) |  | Write-Offs, Write-Downs & Deductions |  | Balance at End of Period (a)
Year ended December 31, 2019: |  |  |  |  |  |  |  |  |  |  |
Allowances deducted from asset account |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ | 103.7 |  |  | $ | 30.0 |  |  | $ | (0.7 | ) |  | $ | — |  |  | $ | (27.6 | ) |  | $ | 105.4 |
Year ended December 31, 2018: |  |  |  |  |  |  |  |  |  |  |
Allowances deducted from asset account |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ | 100.3 |  |  | $ | 31.2 |  |  | $ | (3.8 | ) |  | $ | 1.3 |  |  | $ | (25.3 | ) |  | $ | 103.7 |
Year ended December 31, 2017: |  |  |  |  |  |  |  |  |  |  |
Allowances deducted from asset account |  |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ | 85.6 |  |  | $ | 27.1 |  |  | $ | 3.8 |  |  | $ | 3.5 |  |  | $ | (19.7 | ) |  | $ | 100.3 |
(a) | Amounts include allowance for doubtful accounts classified as current and noncurrent.
(b) Amounts related to businesses acquired, net of amounts related to businesses disposed not included in discontinued operations.

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- Definition Tabular disclosure of valuation allowances to reduce deferred tax assets to net realizable value, including identification of the deferred tax asset more likely than not will not be fully realized and the corresponding amount of the valuation allowance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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