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Quarterly Financial Data (Unaudited) | 12 Months Ended
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Dec. 31, 2016
Quarterly Financial Data [Abstract] |
Quarterly Financial Data (Unaudited) | Quarterly Financial Data (Unaudited) The following tables present the unaudited financial data for each of the interim periods in 2016 and 2015 (in millions of dollars, except per share amounts):
|  | Quarter Ended 31-Mar |  | Quarter Ended 30-Jun |  | Quarter Ended 30-Sep |  | Quarter Ended 31-Dec
2016 |  |  |  |  |  |  |  |
Net sales |  | $ | 343.2 |  |  | $ | 334.9 |  |  | $ | 320.6 |  |  | $ | 331.9 |
Cost of products sold, excluding depreciation, amortization and other items |  | 262.0 |  |  | 250.4 |  |  | 254.7 |  |  | 252.4 |
Lower of cost or market inventory write-down |  | 4.9 |  |  | — |  |  | — |  |  | — |
Unrealized gain on derivative instruments |  | (4.0 | ) |  | (10.9 | ) |  | (2.0 | ) |  | (1.8 | )
Gross profit |  | 80.3 |  |  | 95.4 |  |  | 67.9 |  |  | 81.3 |
Operating income |  | 44.8 |  |  | 57.9 |  |  | 29.8 |  |  | 45.3 |
Net income |  | $ | 26.3 |  |  | $ | 26.0 |  |  | $ | 14.9 |  |  | $ | 24.5 |
Net income per common share, Basic |  | $ | 1.47 |  |  | $ | 1.45 |  |  | $ | 0.84 |  |  | $ | 1.39 |
Net income per common share, Diluted |  | $ | 1.44 |  |  | $ | 1.43 |  |  | $ | 0.82 |  |  | $ | 1.37 |
|  | Quarter Ended 31-Mar 1 |  | Quarter Ended 30-Jun |  | Quarter Ended 30-Sep |  | Quarter Ended 31-Dec
2015 |  |  |  |  |  |  |  |
Net sales |  | $ | 371.7 |  |  | $ | 367.2 |  |  | $ | 336.4 |  |  | $ | 316.6 |
Cost of products sold, excluding depreciation, amortization and other items |  | 302.3 |  |  | 294.8 |  |  | 267.3 |  |  | 251.0 |
Lower of cost or market inventory write-down |  | — |  |  | — |  |  | — |  |  | 2.6 |
Unrealized loss (gain) on derivative instruments |  | 4.5 |  |  | 1.5 |  |  | 1.7 |  |  | (4.3 | )
Gross profit |  | 64.9 |  |  | 70.9 |  |  | 67.4 |  |  | 67.3 |
Operating (loss) income |  | (458.6 | ) |  | 37.0 |  |  | 40.5 |  |  | 35.2 |
Net (loss) income |  | $ | (292.2 | ) |  | $ | 20.2 |  |  | $ | 22.1 |  |  | $ | 13.3 |
Net (loss) income per common share, Basic |  | $ | (16.85 | ) |  | $ | 1.19 |  |  | $ | 1.29 |  |  | $ | 0.76 |
Net (loss) income per common share, Diluted |  | $ | (16.85 | ) |  | $ | 1.11 |  |  | $ | 1.21 |  |  | $ | 0.73 |
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1. | The quarter ended March 31, 2015 includes the loss recognized on removal of the Union VEBA net assets. See Note 6 for additional information.

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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 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=68076893&loc=d3e1570-108306 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e765-108305 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=68064558&loc=d3e725-108305 + Details
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