Other Employee Benefit Programs Defined Benefit Plans (Details) - North American Operations [Member] $ in Millions	Dec. 31, 2017 USD ($) employee
Pension Plan [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Employees participating in defined benefit plan | employee	230
Defined benefit plan, liabilities recognized in balance sheet	$ (3.0)
Accumulated other comprehensive (income)/loss, pension and other postretirement benefit plans, net of tax	$ (1.4)
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	$ (7.0)
Accumulated other comprehensive (income)/loss, pension and other postretirement benefit plans, net of tax	$ 0.1