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Pensions and Other Post-retirement Benefits - Additional Information (Details) - USD ($) $ in Millions | 9 Months Ended
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Sep. 30, 2017 | Sep. 30, 2016
Retirement Benefits [Abstract] |  |
Pension plans contributions | $ 4.4 | $ 4.7
Total estimated pension plans contributions for the fiscal year | $ 5.9 |

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