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Critical accounting estimates and judgments (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Jun. 30, 2025
Dec. 31, 2024
Sep. 30, 2024
 [3]
Jun. 30, 2024
Dec. 31, 2023
Critical accounting estimates and judgments            
Cash and cash equivalents [1] $ 647.6   $ 578.0 [2]      
Cash and cash equivalents including cash equivalents classified as held for sale 651.5 [3] $ 533.1 $ 578.0 $ 397.5 $ 445.7 $ 293.8
Cash and cash equivalents held for sale $ 3.9          
[1] Excludes $3.9 million cash classified within assets held for sale as of September 30, 2025 (see note 20).
[2] September 30, 
[3] Includes $3.9 million classified within assets held for sale as of September 30, 2025 (see note 20).