Other Employee Benefit Programs Defined Benefit Plans (Details) - North American Operations [Member] $ in Millions	Dec. 31, 2018 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	247
Defined benefit plan, liabilities recognized in balance sheet	$ 2.1
Accumulated other comprehensive (income)/loss, pension and other postretirement benefit plans, net of tax	$ 1.5
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	67
Defined benefit plan, liabilities recognized in balance sheet	$ 7.4
Accumulated other comprehensive (income)/loss, pension and other postretirement benefit plans, net of tax	$ (0.2)