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Related parties transactions (Tables)
12 Months Ended
Dec. 31, 2023
Related Party [Abstract]  
Disclosure of transactions between related parties
The following table summarizes compensation information for key management personnel:
($ millions)202320222021
Cash and other compensation20.1 18.7 19.3 
Post-employment benefits1.1 0.9 0.9 
Equity-based compensation23.1 22.4 20.9 
Total44.3 42.0 41.1