Other Employee Benefit Programs Defined Benefit Plans (Details) $ in Millions	Dec. 31, 2015 USD ($) employee
Pension plans, defined benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employees participating in defined benefit plan | employee	270
Defined benefit plan, liabilities recognized in balance sheet	$ (2.0)
Accumulated other comprehensive income/(loss), pension and other postretirement benefit plans, net of tax	$ (0.4)
Defined benefit postretirement health care and life insurance benefits [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employees participating in defined benefit plan | employee	65
Defined benefit plan, liabilities recognized in balance sheet	$ (6.7)
Accumulated other comprehensive income/(loss), pension and other postretirement benefit plans, net of tax	$ 1.0