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Stockholders' equity - ASR - Additional Information (Details) - Accelerate share repurchase - USD ($)
2 Months Ended 6 Months Ended
Sep. 09, 2021
May 03, 2021
Mar. 02, 2022
Jul. 12, 2022
Jun. 30, 2022
Jun. 30, 2021
Stockholders Equity Note            
Stock repurchase program authorized amount   $ 350,000,000 $ 400,000,000   $ 400,000,000 $ 350,000,000
Accelerated share repurchases price paid per share $ 75.8430          
Accelerated share repurchases settlement payment     $ 400,000,000      
Initial shares received as part of an accelerated share repurchase program   3,785,831 3,483,942   3,483,942  
Common Shares Repurchased Accelerated Share Repurchase Agreements 828,965          
Common shares attributable to ASR 4,614,796          
Treasury stock            
Stockholders Equity Note            
Common stock purchases $ 61,000,000 $ 280,000,000 $ (320,000,000)      
Capital surplus            
Stockholders Equity Note            
Common stock purchases $ 61,000,000 $ (70,000,000) $ (80,000,000)      
Subsequent event            
Stockholders Equity Note            
Accelerated share repurchases price paid per share       $ 78.9443    
Common Shares Repurchased Accelerated Share Repurchase Agreements       1,582,922    
Common shares attributable to ASR       5,066,864    
Subsequent event | Treasury stock            
Stockholders Equity Note            
Common stock purchases       $ 120,000,000    
Subsequent event | Capital surplus            
Stockholders Equity Note            
Common stock purchases       $ 120,000,000