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Supplemental Quarterly Information | 12 Months Ended
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Dec. 31, 2017
Supplemental Quarterly Information [Abstract] |
Supplemental Quaterly Information | ﻿ ﻿
﻿ |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |
﻿(Millions of dollars except per share amounts) | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter |  | Year
﻿Year ended December 31, 2017 |  |  |  |  |  |  |  |  |  |
﻿Sales and other operating revenues | $ | 544.7 |  | 509.7 |  | 498.3 |  | 545.0 |  | 2,097.7
﻿Income (loss) from continuing operations before income taxes |  | 154.9 |  | (21.9) |  | (63.6) |  | 2.4 |  | 71.8
﻿Income (loss) from continuing operations |  | 57.5 |  | (17.3) |  | (66.3) |  | (284.8) |  | (310.9)
﻿Net income (loss) |  | 58.5 |  | (17.6) |  | (65.9) |  | (286.8) |  | (311.8)
﻿Income (loss) from continuing operations per Common share |  |  |  |  |  |  |  |  |  |
﻿ Basic |  | 0.33 |  | (0.10) |  | (0.38) |  | (1.65) |  | (1.81)
﻿ Diluted |  | 0.33 |  | (0.10) |  | (0.38) |  | (1.65) |  | (1.81)
﻿Net income (loss) per Common share |  |  |  |  |  |  |  |  |  |
﻿ Basic |  | 0.34 |  | (0.10) |  | (0.38) |  | (1.66) |  | (1.81)
﻿ Diluted |  | 0.34 |  | (0.10) |  | (0.38) |  | (1.66) |  | (1.81)
﻿Cash dividend per Common share |  | 0.25 |  | 0.25 |  | 0.25 |  | 0.25 |  | 1.00
﻿Market price of Common Stock 1 |  |  |  |  |  |  |  |  |  |
﻿ High |  | 32.18 |  | 28.71 |  | 27.43 |  | 31.98 |  | 32.18
﻿ Low |  | 25.76 |  | 24.06 |  | 22.63 |  | 25.02 |  | 22.63
﻿Year ended December 31, 2016 |  |  |  |  |  |  |  |  |  |
﻿Sales and other operating revenues | $ | 429.1 |  | 411.2 |  | 486.3 |  | 483.0 |  | 1,809.6
﻿Loss from continuing operations before income taxes |  | (265.0) |  | (131.3) |  | (16.7) |  | (80.1) |  | (493.1)
﻿Income (loss) from continuing operations |  | (199.5) |  | 2.9 |  | (14.6) |  | (62.8) |  | (274.0)
﻿Net income (loss) |  | (198.8) |  | 2.9 |  | (16.2) |  | (63.9) |  | (276.0)
﻿Income from continuing operations per Common share |  |  |  |  |  |  |  |  |  |
﻿ Basic |  | (1.16) |  | 0.02 |  | (0.08) |  | (0.36) |  | (1.59)
﻿ Diluted |  | (1.16) |  | 0.02 |  | (0.08) |  | (0.36) |  | (1.59)
﻿Net income (loss) per Common share |  |  |  |  |  |  |  |  |  |
﻿ Basic |  | (1.16) |  | 0.02 |  | (0.08) |  | (0.37) |  | (1.60)
﻿ Diluted |  | (1.16) |  | 0.02 |  | (0.08) |  | (0.37) |  | (1.60)
﻿Cash dividend per Common share |  | 0.35 |  | 0.35 |  | 0.25 |  | 0.25 |  | 1.20
﻿Market price of Common Stock 1 |  |  |  |  |  |  |  |  |  |
﻿ High |  | 26.69 |  | 36.24 |  | 32.66 |  | 34.30 |  | 36.24
﻿ Low |  | 15.76 |  | 23.49 |  | 25.14 |  | 25.00 |  | 15.76
﻿ 1 Prices are as quoted on the New York Stock Exchange.

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- Definition The entire disclosure for quarterly financial data. Includes, but is not limited to, tabular presentation of financial information for fiscal quarters, effect of year-end adjustments, and an explanation of matters or transactions that affect comparability of the information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -URI http://asc.fasb.org/topic&trid=2126967 + Details
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