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Pension and Other Postretirement Benefits- Health Care Cost Trends (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]    
Effect on total of service and interest cost components, increase $ 0.0  
Effect on total of service and interest cost components, decrease $ 0.0  
Postretirement Benefits Other than Pensions    
Defined Benefit Plan Disclosure [Line Items]    
Effect on post-retirement benefit other than pension obligation, increase   $ 0.3
Effect on post-retirement benefit other than pension obligation, decrease   $ (0.3)