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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule of Valuation and Qualifying Accounts | Schedule II - Valuation and Qualifying Accounts
($ in millions) | Balance at beginning of period | Charged to costs and expenses (1) | Deductions (2) | Balance at end of period
For the year ended December 31, 2020 |  |  |  |
Allowances deducted from assets: |  |  |  |
Deferred tax asset valuation allowance | $ | 15.9 |  | $ | — |  | $ | (0.8) |  | $ | 15.1 |
Allowance for doubtful accounts | 0.5 |  | 0.7 |  | (0.1) |  | 1.1 |
Total allowances deducted from assets | $ | 16.4 |  | $ | 0.7 |  | $ | (0.9) |  | $ | 16.2 |
For the year ended December 31, 2019 |  |  |  |
Allowances deducted from assets: |  |  |  |
Deferred tax asset valuation allowance | $ | 16.0 |  | $ | — |  | $ | (0.1) |  | $ | 15.9 |
Allowance for doubtful accounts | 2.0 |  | 0.1 |  | (1.6) |  | 0.5 |
Total allowances deducted from assets | $ | 18.0 |  | $ | 0.1 |  | $ | (1.7) |  | $ | 16.4 |
For the year ended December 31, 2018 |  |  |  |
Allowances deducted from assets: |  |  |  |
Deferred tax asset valuation allowance | $ | 20.9 |  | $ | (3.0) |  | $ | (1.9) |  | $ | 16.0 |
Allowance for doubtful accounts | 0.5 |  | 0.7 |  | 0.8 |  | 2.0 |
Total allowances deducted from assets | $ | 21.4 |  | $ | (2.3) |  | $ | (1.1) |  | $ | 18.0 |
(1)Included within the allowance for doubtful accounts activity is the effect of the modified retrospective application of a new accounting standard mentioned in Note 2. (2)Includes accounts receivable written off, the write-off or write-down of valuation allowances, and translation adjustments.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 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) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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