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Retirement Benefits - Narrative - Plan Assumptions (Details) - Participant
12 Months Ended
Dec. 01, 2015
Dec. 31, 2016
Nov. 30, 2015
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Expected long-term rate of return on assets 7.00% 7.00% 8.00%
Medical Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Initial healthcare trend rate (pre 65/post 65)   7.00%  
Number of participants   65  
Number of years until rate reaches ultimate trend rate   4 years  
Ultimate healthcare trend rate   5.00%