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Revision to prior period financial statements (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Property, plant and equipment. $ 1,468.0   $ 1,468.0   $ 1,322.2 [1]  
Deferred tax liabilities 97.6   97.6   88.6 [1]  
Retained earnings (6,724.5)   (6,724.5)   (6,944.0) [1]  
Non-current deferred revenue 104.5   104.5   45.4  
Current deferred revenue 28.3   28.3   19.5  
Revenue 455.1 $ 420.3 1,328.0 $ 1,273.4    
Increase (decrease) in cash and cash equivalents before effect of exchange rate changes 115.0 (48.7) 67.2 162.2    
Trade and other non-current payables 120.3   120.3   50.6 [1]  
Trade and other current payables 335.3   335.3   377.1 [1]  
Nigeria            
Revenue $ 268.0 $ 242.3 $ 799.7 $ 739.6    
Restatement amount            
Property, plant and equipment.         (30.5) $ (30.5)
Deferred tax liabilities         (11.9) (11.9)
Retained earnings         (18.6) $ (18.6)
Restatement amount | Nigeria            
Trade and other non-current payables         45.4  
Trade and other current payables         $ (45.4)  
[1] September 30,