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Related parties transactions
12 Months Ended
Dec. 31, 2022
Related Party [Abstract]  
Related parties transactions Related parties transactions
Executive officers
The following table summarizes compensation information for key management personnel:
($ millions)202220212020
Cash and other compensation18.7 19.3 12.8 
Post-employment benefits0.9 0.9 1.1 
Equity-based compensation22.4 20.9 9.2 
Total42.0 41.1 23.1