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Pension Plan and Employee Benefits, Pension Plan Investment Objectives (Details) - Successor [Member] - Pension Benefits [Member]
12 Months Ended
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]  
Maximum notional value of derivative positions of the total pension fund's value 20.00%
Return Seeking [Member]  
Investment asset allocation target percentage of total plan assets [Abstract]  
Target plan allocations, minimum 35.00%
Target plan allocations 40.00%
Target plan allocations, maximum 45.00%
Domestic equity [Member]  
Investment asset allocation target percentage of total plan assets [Abstract]  
Target plan allocations 18.00%
International equity [Member]  
Investment asset allocation target percentage of total plan assets [Abstract]  
Target plan allocations 17.00%
Real estate funds [Member]  
Investment asset allocation target percentage of total plan assets [Abstract]  
Target plan allocations 5.00%
Liability Hedging [Member]  
Investment asset allocation target percentage of total plan assets [Abstract]  
Target plan allocations, minimum 55.00%
Target plan allocations 60.00%
Target plan allocations, maximum 65.00%