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Acquisitions - TBEI Pro Forma (Details) - TBEI - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition [Line Items] |  |
Net sales | $ 987.6 | $ 913.2
Income from continuing operations | $ 68.1 | $ 49.4
Diluted earnings from continuing operations (per share) | $ 1.13 | $ 0.81

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