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Pension Plans and Other Benefits - Fair Value Assumptions (Details) - North American Pension Plans
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
The assumptions used to determine benefit obligations were as follows:      
Discount rate 4.09% 3.51% 3.97%
Expected return on plan assets 5.14% 5.54% 5.54%
Rate of compensation increase 3.50% 3.50% 3.50%
The assumptions used to determine net benefit cost were as follows:      
Discount rate 3.51% 3.97% 4.17%
Service cost discount rate [1] 3.50% 4.02% 4.19%
Interest cost discount rate [1] 3.21% 3.44% 3.45%
Expected return on plan assets 5.54% 5.54% 5.66%
Rate of compensation increase 3.50% 3.50% 3.50%
[1] In 2016, we changed the method used to estimate the service and interest cost components of net periodic benefit cost for our defined benefit pension and other postretirement benefit plans by electing a full yield curve approach and applying the specific spot rates along the yield curve used in the determination of the benefit obligation to the relevant projected cash flows. The impact of this change to our earnings and earnings per share was not material.