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Accounting Policies - Stock Based Compensation (Details) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) item $ / shares | Dec. 31, 2016 USD ($) $ / shares | Dec. 31, 2015 USD ($) $ / shares
Stock-based compensation |  |  |
Number of stock-based compensation plans | item | 1 |  |
Total unrecognized compensation costs related to unvested stock-based compensation arrangements | $ 14.8 |  |
Total weighted average remaining term of unrecognized compensation costs | 1 year 6 months 26 days |  |
Compensation cost recognized | $ 13.9 | $ 13.4 | $ 10.9
Number of Reportable Segments | item | 3 |  |
Impact on both basic and diluted net income per common share for recognition of total stock-based compensation expense (in dollars per share) | $ / shares | $ 0.28 | $ 0.29 | $ 0.25
Cost of goods sold. |  |  |
Stock-based compensation |  |  |
Compensation cost recognized | $ 0.8 | $ 0.9 | $ 0.4
Selling, general and administrative expenses |  |  |
Stock-based compensation |  |  |
Compensation cost recognized | 12.5 | 10.5 |
Stock options |  |  |
Stock-based compensation |  |  |
Tax benefit recorded for the compensation expense | 0.1 | 0.8 | 0.3
Other Stock-based Plans |  |  |
Stock-based compensation |  |  |
Tax benefit recorded for the compensation expense | $ 3.9 | $ 2.8 | $ 2.0

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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