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Business Acquisitions Business Acquisitions - Actual and Pro Forma Net Sales and Income from Continuing Operations (Details) - USD ($) $ in Millions | 2 Months Ended | 11 Months Ended | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Conwed Plastics LLC [Member] |  |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |  |
Net Sales, Actual |  | $ 141.3 |  |  |
Net Sales, Pro Forma |  |  | $ 989.8 | $ 984.1 |
(Loss) Income from Continuing Operations, Actual |  | $ 11.9 |  |  |
(Loss) Income from Continuing Operations, Pro Forma |  |  | $ 31.1 | $ 90.6 |
Argotec [Member] |  |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |  |
Net Sales, Actual | $ 22.3 |  |  |  |
Net Sales, Pro Forma |  |  |  |  | $ 859.7
(Loss) Income from Continuing Operations, Actual | $ 0.9 |  |  |  |
(Loss) Income from Continuing Operations, Pro Forma |  |  |  |  | $ 90.2

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- Definition Amount after tax of pro forma income from continuing operations as if the business combination had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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- Definition This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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