Defined Benefit Pension Plans Actuarial Assumptions (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Defined benefit plan disclosure [Line Items]
Discount rate	4.20%	4.70%	4.30%
Expected long-term rate of return on plan assets	5.00%	7.25%	7.50%
Equity securities [Member]
Defined benefit plan disclosure [Line Items]
Defined benefit plan, target plan asset allocations range minimum	20.00%
Defined benefit plan, target plan asset allocations range maximum	40.00%
Fixed income and cash [Member]
Defined benefit plan disclosure [Line Items]
Defined benefit plan, target plan asset allocations range minimum	50.00%
Defined benefit plan, target plan asset allocations range maximum	70.00%
Alternative investments [Member]
Defined benefit plan disclosure [Line Items]
Defined benefit plan, target plan asset allocations range minimum	0.00%
Defined benefit plan, target plan asset allocations range maximum	15.00%
Minimum [Member]
Defined benefit plan disclosure [Line Items]
Defined benefit plan, risk management practices, investment evaluation period	3 years
Maximum [Member]
Defined benefit plan disclosure [Line Items]
Defined benefit plan, risk management practices, investment evaluation period	5 years