Employee Benefit Programs Defined Benefit Plans (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014 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	270
Defined benefit plan, amounts recognized in balance sheet	$ 3.2
Accumulated other comprehensive income/(loss), pension and other postretirement benefit plans, net of tax	(0.1)
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	65
Defined benefit plan, amounts recognized in balance sheet	5.9
Accumulated other comprehensive income/(loss), pension and other postretirement benefit plans, net of tax	$ 1.5