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Pension and Other Postretirement Benefits - U.S. defined benefit plan (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Pension and Other Postretirement Benefits    
Future expected blended long-term rate of return on plan assets (as a percent) 5.01%  
Minimum | U.S. Defined Benefit Plan | Return-seeking investment    
Pension and Other Postretirement Benefits    
Asset allocation (as a percent) 57.00% 50.00%
Minimum | U.S. Defined Benefit Plan | Liability-hedging investment    
Pension and Other Postretirement Benefits    
Asset allocation (as a percent) 28.00% 24.00%
Maximum | U.S. Defined Benefit Plan | Return-seeking investment    
Pension and Other Postretirement Benefits    
Asset allocation (as a percent) 72.00% 76.00%
Maximum | U.S. Defined Benefit Plan | Liability-hedging investment    
Pension and Other Postretirement Benefits    
Asset allocation (as a percent) 43.00% 50.00%