Pension Plans and Other Post Employment Benefit Plans Weighted Average Assumptions used to Determine Benefit Obligations - Pension (Details) - Pension Plan		Dec. 31, 2017	Aug. 31, 2017	Dec. 31, 2016
Successor [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate		3.37%
Rate of increase in future compensation levels	[1]	4.04%
Predecessor [Member]
Defined Benefit Plan Disclosure [Line Items]
Discount Rate			3.42%	3.80%
Rate of increase in future compensation levels	[1]			3.80%

[1] The rate of compensation increase represents the single annual effective salary increase that an average plan participant would receive during the participant's entire career at the company.