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Consolidated Stockholders' Equity Statements (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statement of Stockholders' Equity [Abstract] |  |  |
Foreign currency translation, tax expense (benefit) | $ 1.3 | $ 1.2 | $ 1.3
Adjustments to pension and postretirement liability, tax expense | $ 2.2 | $ 1.9 | $ 3.1
Dividends declared per share | $ 0.2 | $ 0.20 | $ 0.20

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