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Pension and Postretirement Benefits - Narrative (Details)
$ in Millions
9 Months Ended
Sep. 30, 2015
USD ($)
Pension Plans | Funded Plan  
Defined Benefit Plan Disclosure [Line Items]  
Amount expected to contribute in funded pension plans $ 1.4
Pension Contributions 1.0
Pension Plans | Unfunded Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
Amount expected to contribute in unfunded pension plans 0.8
Pension Contributions 0.5
US 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 $ 1.0