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Quarterly Results of Operations (unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |
Quarterly Results of Operations (unaudited) [Table Text Block] |
|  | 2017
|  | First Quarter |  | Second Quarter |  | Third Quarter |  | Fourth Quarter (a)
|  | (millions, except per-share amounts)
Net sales |  | $ | 974.4 |  |  | $ | 1,138.9 |  |  | $ | 1,226.6 |  |  | $ | 1,092.0 |
Income from operations |  | $ | 21.1 |  |  | $ | 42.4 |  |  | $ | 56.0 |  |  | $ | 21.6 |
Net income |  | $ | 10.0 |  |  | $ | 22.2 |  |  | $ | 31.7 |  |  | $ | 19.1 |
Net income per common share – Basic |  | $ | 0.26 |  |  | $ | 0.57 |  |  | $ | 0.82 |  |  | $ | 0.49 |
Net income per common share – Diluted |  | $ | 0.26 |  |  | $ | 0.57 |  |  | $ | 0.81 |  |  | $ | 0.49 |
|  | 2016
|  | First Quarter |  | Second Quarter |  | Third Quarter (b) |  | Fourth Quarter (c)
|  | (millions, except per-share amounts)
Net sales |  | $ | 880.7 |  |  | $ | 1,043.8 |  |  | $ | 1,067.2 |  |  | $ | 919.5 |
Income (loss) from operations |  | $ | 13.4 |  |  | $ | 37.9 |  |  | $ | 31.3 |  |  | $ | (3.0 | )
Net income |  | $ | 5.0 |  |  | $ | 19.2 |  |  | $ | 10.0 |  |  | $ | 4.1 |
Net income per common share – Basic |  | $ | 0.13 |  |  | $ | 0.50 |  |  | $ | 0.26 |  |  | $ | 0.11 |
Net income per common share – Diluted |  | $ | 0.13 |  |  | $ | 0.49 |  |  | $ | 0.26 |  |  | $ | 0.11 |
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(a) | Fourth quarter 2017 results include an $8.1 million, or $0.21 per share, income tax benefit associated with the effects of the Tax Cuts and Jobs Act discussed further in Note 3, Income Taxes.
(b) | Third quarter 2016 results include a $5.9 million, or $0.15 per share, after-tax loss on the extinguishment of debt, as we refinanced our senior notes. For more information, see Note 7, Debt.
(c) | The following items impacted fourth quarter 2016 results:
• | $8.5 million, or $0.22 per share, income tax benefit primarily associated with the reversal of a valuation allowance on foreign deferred tax assets, net of other tax adjustments. For more information, see Note 3, Income Taxes.
• | $3.0 million, $0.08 per share, after-tax loss on the extinguishment of debt, as we refinanced our senior notes. For more information, see Note 7, Debt.
• | $2.4 million, or $0.06 per share, after-tax settlement expense associated with voluntary lump-sum payments to pension plan participants. For more information, see Note 9, Retirement and Benefit Plans.

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- Definition Tabular disclosure of quarterly financial data. Includes, but is not limited to, financial information for fiscal quarters, cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=84173487&loc=d3e1280-108306 + Details
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