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Pension Plans and Other Postretirement Benefits Multiemployer Plan (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Chemetall Surface Treatment |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Multiemployer plan, period contributions |  | $ 0.2 |  | $ 0.4
Continuing Operations |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Multiemployer plan, period contributions | $ 0.3 | $ 0.3 | $ 0.5 | $ 0.6
Selling, general and administrative expenses | Financial Improvement Plan |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Multiemployer plan, period contributions | 2.0 |  | 2.0 |
Other expenses, net | Financial Improvement Plan |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |
Multiemployer plan, period contributions | $ 2.9 |  | $ 2.9 |

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- Definition Amount of contributions made to multiemployer plan by employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947 + Details
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