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Schedule II - Valuation Accounts and Reserves | 12 Months Ended
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Dec. 31, 2019
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
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 |
2017 |  |  |  |  |  |  |  |  |
Deducted from asset accounts: |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts | $ | 1.6 |  |  | — |  |  | — |  |  | — |  |  | 1.6 |
Deferred tax asset valuation allowance | 236.4 |  |  | 18.6 |  |  | — |  |  | 152.3 |  |  | 407.3 |
1 The amounts in 2019 and 2018 for deferred tax asset valuation allowance are primarily associated with utilization of foreign tax credit carryforwards. The amount in 2017 for deferred tax asset valuation are primarily associated with an increase in 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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