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Share-based compensation plans - Stock activity - RSU, PSU, DSU (Details) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Restricted Stock Units    
Shares (in thousands)    
Nonvested, beginning balance, shares 172,700  
Granted, shares 68,100  
Forfeited, shares (5,400)  
Conversion to cash settled awards, shares (1,300)  
Vested, shares (76,600)  
Nonvested, ending balance, shares 157,500 172,700
Weighted-Average Grant Date Fair Value Per Share    
Nonvested, beginning balance (dollars per share) $ 71.87  
Granted (dollars per share) 83.15  
Forfeited (dollars per share) 78.39  
Converted to cash settled awards (dollars per share) 72.80  
Vested (dollars per share) 67.14  
Nonvested, ending balance (dollars per share) $ 78.83 $ 71.87
Performance Shares Units PSU    
Shares (in thousands)    
Nonvested, beginning balance, shares 564,200  
Granted, shares 242,700  
Forfeited, shares (6,400)  
Conversion to cash settled awards, shares (4,600)  
Vested, shares (204,300)  
Nonvested, ending balance, shares 591,600 564,200
Weighted-Average Grant Date Fair Value Per Share    
Nonvested, beginning balance (dollars per share) $ 70.10  
Granted (dollars per share) 84.60  
Forfeited (dollars per share) 76.12  
Converted to cash settled awards (dollars per share) 65.42  
Vested (dollars per share) 56.72  
Nonvested, ending balance (dollars per share) $ 80.64 $ 70.10
Actual shares earned and distributed (shares)   394,000.0
Target shares (shares)   204,300
Deferred Stock Units    
Shares (in thousands)    
Nonvested, beginning balance, shares 12,100  
Granted, shares 0  
Vested, shares 0  
Nonvested, ending balance, shares 12,100 12,100
Weighted-Average Grant Date Fair Value Per Share    
Nonvested, beginning balance (dollars per share) $ 79.69  
Granted (dollars per share) 0  
Vested (dollars per share) 0  
Nonvested, ending balance (dollars per share) $ 79.69 $ 79.69