Annual report pursuant to Section 13 and 15(d)

Pension and Other Postretirement Benefit Programs - Asset Allocation (Details)

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Pension and Other Postretirement Benefit Programs - Asset Allocation (Details)
12 Months Ended
Dec. 31, 2016
U.S. Defined Benefit Pension Plans | Fixed income securities  
Defined Benefit Plan Disclosure [Line Items]  
Target Weight End of Period 60.00%
Position at End of Period 60.00%
U.S. Defined Benefit Pension Plans | Equities  
Defined Benefit Plan Disclosure [Line Items]  
Target Weight End of Period 40.00%
Position at End of Period 40.00%
Canadian Defined Benefit Pension Plans | Fixed income securities  
Defined Benefit Plan Disclosure [Line Items]  
Target Weight End of Period 50.00%
Position at End of Period 49.00%
Canadian Defined Benefit Pension Plans | Equities  
Defined Benefit Plan Disclosure [Line Items]  
Target Weight End of Period 48.00%
Position at End of Period 48.00%
Canadian Defined Benefit Pension Plans | Other  
Defined Benefit Plan Disclosure [Line Items]  
Target Weight End of Period 2.00%
Position at End of Period 3.00%