Employee Benefit Plans (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) Age
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Benefit determination period for pension plan	5 years
Defined benefit plan, non-contributory, retirement age requirement | Age	62
Defined benefit plan, contributory, retirement age requirement | Age	62
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected employer contributions in next fiscal year | $	$ 3.1
Postretirement health and life plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Expected employer contributions in next fiscal year | $	$ 0.9
Minimum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, contributory, employee contribution percentage	25.00%
Maximum [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit plan, contributory, employee contribution percentage	100.00%