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Pensions and Other Post-retirement Benefits - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Retirement Benefits [Abstract]
Pension plans contributions	$ 1.8	$ 1.2
Total estimated pension plans contributions for the fiscal year	$ 7.1

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Amount of contribution received by defined benefit plan from employer which increases plan assets.

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