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Pension and Postretirement Benefits - Narrative (Details)
$ in Millions
6 Months Ended
Jun. 30, 2018
USD ($)
Postretirement Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
Amount expected to contribute in postretirement benefit plans $ 1.1
Pension and Other Postretirement Benefit Contributions 0.6
Funded Plans | Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
Amount expected to contribute in funded pension plans 1.0
Pension Contributions 0.5
Unfunded Pension Plans | Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
Amount expected to contribute in unfunded pension plans 1.0
Pension Contributions $ 0.4