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Pension and Other Post-Retirement Benefits (Details 5)
$ in Millions
12 Months Ended
Dec. 31, 2015
USD ($)
Effect on the other post-retirement benefit cost and obligation  
Effect on total of service and interest cost, one percentage point increase $ 0.1
Effect on total of service and interest cost, one percentage point decrease (0.1)
Effect on post-retirement benefit obligation, one percentage point increase 1.5
Effect on post-retirement benefit obligation, one percentage point decrease $ (1.3)