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Schedule II - Valuation Accounts and Reserves | 12 Months Ended
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Dec. 31, 2017
Schedule II - Valuation Accounts and Reserves [Abstract] |
Schedule II - Valuation Accounts and Reserves | ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |
﻿(Millions of dollars) | Balance at January 1 |  | Charged to Expense |  | Deductions |  | Other 1 |  | Balance at December 31
﻿2017 |  |  |  |  |  |  |  |  |  |
﻿Deducted from asset accounts: |  |  |  |  |  |  |  |  |  |
﻿ Allowance for doubtful accounts | $ | 1.6 |  | – |  | – |  | – |  | 1.6
﻿ Deferred tax asset valuation allowance |  | 305.4 |  | 18.6 |  | – |  | 152.3 |  | 476.3
﻿2016 |  |  |  |  |  |  |  |  |  |
﻿Deducted from asset accounts: |  |  |  |  |  |  |  |  |  |
﻿ Allowance for doubtful accounts | $ | 1.6 |  | – |  | – |  | – |  | 1.6
﻿ Deferred tax asset valuation allowance |  | 294.4 |  | 25.7 |  | – |  | (14.7) |  | 305.4
﻿2015 |  |  |  |  |  |  |  |  |  |
﻿Deducted from asset accounts: |  |  |  |  |  |  |  |  |  |
﻿ Allowance for doubtful accounts | $ | 1.6 |  | – |  | – |  | – |  | 1.6
﻿ Deferred tax asset valuation allowance |  | 306.5 |  | 40.8 |  | – |  | (52.9) |  | 294.4
﻿ 1 Amount s in 2017 and 2016 for deferred tax asset valuations are primarily associated with an increase in foreign tax credit carryforwards. The a mount in 2015 for deferred tax asset valuation allowance is primarily associated with utilization of foreign tax credit carryforwards.

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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- References No definition available. + Details
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