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Pensions and Other Post-retirement Benefits - Additional Information (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Pension plans contributions $ 2.5 $ 3.0  
Total estimated pension plans contributions for the fiscal year $ 5.0    
Change in Assumptions for Defined Benefit Plans | Scenario, Forecast      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)     $ 1.8