Pension Plans and Other Post Employment Benefit Plans Target Allocation for Plan Assets (Details) - Pension Plan	Dec. 31, 2017	Dec. 31, 2016
Successor [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation for plan assets	100.00%
Successor [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation for plan assets	50.00%
Successor [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation for plan assets	2.00%
Successor [Member] | Private Market Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation for plan assets	8.00%
Successor [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation for plan assets	3.00%
Successor [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation for plan assets	2.00%
Successor [Member] | UNITED STATES | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation for plan assets	17.00%
Successor [Member] | Non-US [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation for plan assets	18.00%
Predecessor [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation for plan assets		100.00%
Predecessor [Member] | Fixed Income Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation for plan assets		33.00%
Predecessor [Member] | Hedge Funds [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation for plan assets		2.00%
Predecessor [Member] | Private Market Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation for plan assets		8.00%
Predecessor [Member] | Real Estate [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation for plan assets		4.00%
Predecessor [Member] | Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation for plan assets		2.00%
Predecessor [Member] | UNITED STATES | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation for plan assets		27.00%
Predecessor [Member] | Non-US [Member] | Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Target Allocation for plan assets		24.00%