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Related parties transactions (Tables)
 12 Months Ended
Dec. 31, 2024
Related Party [Abstract]  
Disclosure of transactions between related parties
The below table summarizes compensation information for key management personnel.
($ millions)202420232022
Cash and other compensation24.4 20.1 18.7 
Post-employment benefits2.9 1.1 0.9 
Equity-based compensation22.5 23.1 22.4 
Total49.8 44.3 42.0 
Disclosure of investments in associated companies The below table summarizes activity related to investments in associated companies for the years ended December 31, 2024 and 2023. There were no investments in associated companies in 2022.
Investments in associated companies
($ millions)20242023
Balance as of January 110 — 
Purchases159 10 
Transfer from Financial assets132 — 
Share of (loss) from associated companies recognized in Consolidated Income Statement(8)— 
Balance as of December 31293 10