Pensions and Other Postretirement Benefits - Allocation of Plan Assets (Details)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocations	100.00%
Actual plan asset allocations	100.00%	100.00%
Cash
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocations	0.00%
Actual plan asset allocations	1.10%	2.60%
Equity Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocations	59.00%
Actual plan asset allocations	51.70%	51.00%
Fixed Income Securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocations	41.00%
Actual plan asset allocations	41.60%	39.90%
Other Investments
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target plan asset allocations	0.00%
Actual plan asset allocations	5.60%	6.50%