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Share-based compensation plans - Stock activity - RSU, PSU, DSU (Details) - $ / shares
9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Restricted Stock Units    
Shares (in thousands)    
Nonvested, beginning balance, shares 251,100  
Granted, shares 238,600  
Forfeited or expired, shares (34,300)  
Vested, shares (78,400)  
Nonvested, ending balance, shares 377,000.0 251,100
Weighted-Average Grant Date Fair Value Per Share    
Nonvested, beginning balance (dollars per share) $ 74.37  
Granted (dollars per share) 64.60  
Forfeited or expired (dollars per share) 70.52  
Vested (dollars per share) 77.12  
Nonvested, ending balance (dollars per share) $ 67.97 $ 74.37
Performance Shares Units PSU    
Shares (in thousands)    
Nonvested, beginning balance, shares 661,000.0  
Granted, shares 288,000.0  
Forfeited or expired, shares (74,700)  
Vested, shares (142,900)  
Nonvested, ending balance, shares 731,400 661,000.0
Weighted-Average Grant Date Fair Value Per Share    
Nonvested, beginning balance (dollars per share) $ 81.75  
Granted (dollars per share) 67.13  
Forfeited or expired (dollars per share) 82.82  
Vested (dollars per share) 77.61  
Nonvested, ending balance (dollars per share) $ 76.70 $ 81.75
Expired, shares (23,600)  
Expired (dollars per share) $ 105.57  
Actual shares earned and distributed (shares)   144,400
Target shares (shares)   142,900
Deferred Stock Units    
Shares (in thousands)    
Nonvested, beginning balance, shares 14,300  
Granted, shares 18,600  
Vested, shares (13,000.0)  
Nonvested, ending balance, shares 19,900 14,300
Weighted-Average Grant Date Fair Value Per Share    
Nonvested, beginning balance (dollars per share) $ 78.74  
Granted (dollars per share) 54.67  
Vested (dollars per share) 79.79  
Nonvested, ending balance (dollars per share) $ 55.59 $ 78.74