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Pension Plans and Other Postretirement Benefits Multiemployer Plans (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Multiemployer Plans [Line Items] |  |  |
Multiemployer plan minimum level of funding for highest funding zone status | 80.00% |  |
Multiemployer plan, period contributions | $ 1.5 | $ 1.5 | $ 1.7
Minimum |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions to multiemployer plan, percentage of total contributions to plan | 5.00% |  |
Financial Improvement Plan | Selling, general and administrative expenses |  |  |
Multiemployer Plans [Line Items] |  |  |
Multiemployer plan, period contributions | $ 2.3 | $ 3.3 |
Chemetall Surface Treatment |  |  |
Multiemployer Plans [Line Items] |  |  |
Multiemployer plan, period contributions |  |  | $ 1.3

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