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Schedule II - Valuation Accounts and Reserves | 12 Months Ended
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Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract] |
Schedule II - Valuation Accounts and Reserves |
(Millions of dollars) | Balance at January 1 |  | Charged to Expense |  | Deductions |  | Other 1 |  | Balance at December 31
2020 |  |  |  |  |  |  |  |  |
Deducted from asset accounts: |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ | 1.6 |  |  | — |  |  | — |  |  | — |  |  | 1.6 |
Deferred tax asset valuation allowance | 103.1 |  |  | 3.3 |  |  | — |  |  | — |  |  | 106.4 |
2019 |  |  |  |  |  |  |  |  |
Deducted from asset accounts: |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ | 1.6 |  |  | — |  |  | — |  |  | — |  |  | 1.6 |
Deferred tax asset valuation allowance | 166.9 |  |  | 10.9 |  |  | — |  |  | (74.7) |  |  | 103.1 |
2018 |  |  |  |  |  |  |  |  |
Deducted from asset accounts: |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ | 1.6 |  |  | — |  |  | — |  |  | — |  |  | 1.6 |
Deferred tax asset valuation allowance | 407.3 |  |  | 3.3 |  |  | — |  |  | (243.7) |  |  | 166.9 |
1 The amounts in 2019 and 2018 for deferred tax asset valuation allowance are primarily associated with utilization of foreign tax credit carryforwards.

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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=26873400&loc=d3e24092-122690 + Details
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- References No definition available. + Details
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