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Pension Benefits Schedule of Supplemental Employee Retirement Plan (Details)
$ in Millions
May 12, 2016
USD ($)
Pre-Freeze [Member] | Supplemental Employee Retirement Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
Pension and Other Postretirement Benefit Plans, Accumulated Other Comprehensive Income (Loss), Net Gains (Losses), before Tax $ 1.6