Employee Retirement Plans Employee Retirement Plans (Policies)	12 Months Ended
Dec. 31, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension and Other Postretirement Plans, Pensions, Policy [Policy Text Block]	We use a December 31 measurement date for these plans and record the underfunded portion as a liability within non-current liabilities, with the current portion within accrued expenses, on the consolidated balance sheets, recognizing changes in the funded status through OCI.

Employee Retirement Plans Employee Retirement Plans (Policies)

12 Months Ended

Dec. 31, 2018

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Pension and Other Postretirement Plans, Pensions, Policy [Policy Text Block]

We use a December 31 measurement date for these plans and record the underfunded portion as a liability within non-current liabilities, with the current portion within accrued expenses, on the consolidated balance sheets, recognizing changes in the funded status through OCI.