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Stockholders' equity - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Feb. 28, 2019
Sep. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2017
Stockholders Equity Note                    
Stockholders equity   $ 5,908,448   $ 5,435,057 $ 5,244,349 $ 5,908,448 $ 5,244,349 $ 5,719,834 $ 5,289,661 $ 5,103,905
Dividends, Common Stock, Cash   $ 29,017 [1]     $ 25,084 [1] $ 86,996 [2] $ 76,200 [2]      
Dividends Declared per Common Share   $ 0.30     $ 0.25 $ 0.90 $ 0.75      
Dividend payable, to be paid date           Oct. 01, 2019        
Dividends payable, record date           Aug. 30, 2019        
Common stock purchases   $ 1,367     $ 125,099 $ 256,006 [3] $ 127,443      
Accelerated share repurchases settlement receipt     $ 250,000              
Initial shares received as part of an accelerated share repurchase program     3,500,000              
Treasury Stock                    
Stockholders Equity Note                    
Stockholders equity   (392,630)   (205,509) (183,872) (392,630) (183,872) (392,208) (82,754) (90,142)
Common stock purchases   1,367     102,079 203,336 [3] 104,423      
Surplus                    
Stockholders Equity Note                    
Stockholders equity   $ 4,317,556   $ 4,365,606 4,281,515 4,317,556 4,281,515 $ 4,316,225 $ 4,302,946 $ 4,298,503
Common stock purchases         23,020 52,670 [3] 23,020 [3]      
Accelerate Share Repurchase                    
Stockholders Equity Note                    
Accelerated share repurchases price paid per share       $ 51.27            
Common stock purchases $ 250,000         $ 250,000        
Accelerated share repurchases settlement receipt         $ 125,000   $ 125,000      
Initial shares received as part of an accelerated share repurchase program         2,000,000          
Common Shares Repurchased Accelerated Share Repurchase Agreements       438,180            
Accelerate Share Repurchase | Treasury Stock                    
Stockholders Equity Note                    
Common stock purchases     $ 200,000   $ 102,000          
Accelerate Share Repurchase | Surplus                    
Stockholders Equity Note                    
Common stock purchases     $ 50,000   $ 23,000          
[1] Dividends declared per common share during the quarter ended September 30, 2019 - $0.30 (2018 - $0.25).
[2] Dividends declared per common share during the nine months ended September 30, 2019 - $0.90 (2018 - $0.75).
[3] On February 28, 2019, the Corporation entered into a $250 million accelerated share repurchase transaction with respect to its common stock, which was accounted for as a treasury stock transaction. Refer to Note 19 for additional information.