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Affiliated Companies (Tables)
 9 Months Ended
Sep. 30, 2025
Equity Method Investments and Joint Ventures [Abstract]  
Schedule of Investments in Affiliated Companies
The following table summarizes the aggregate carrying amounts of our investments in affiliated companies that are accounted for under the equity method and our investments in affiliated companies that are not accounted for under the equity method:
September 30,December 31,
($ in millions)20252024
Aggregate carrying value of investments in affiliated companies:
   Equity method affiliates$213.6 $194.9 
   Non-equity method affiliates7.3 7.2 
Total investments in affiliated companies$220.9 $202.1 
The following table summarizes the amounts due to and from affiliates in the condensed consolidated balance sheets:
September 30,December 31,
($ in millions)20252024
Payables due to affiliates$19.8 $18.7 
Receivables due from affiliates$1.2 $2.5 
The following table summarizes the Company's affiliate transactions:
Three Months Ended
September 30,		Nine Months Ended
September 30,
($ in millions)2025202420252024
Purchases from (and payments to) affiliates$25.2 $30.1 $83.1 $83.6 
Sales to affiliates$3.4 $3.5 $9.4 $10.7