v3.26.1
Long-term debt (Schedule of detailed information about borrowings) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended 24 Months Ended
Dec. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2025
Disclosure of detailed information about borrowings [line items]        
Borrowings, beginning balance   $ 1,107.5    
Repayments   0.0 $ (100.0)  
Transaction costs   (11.7) (15.1)  
Borrowings, ending balance $ 1,107.5 1,008.6 1,107.5 $ 1,008.6
Senior unsecured notes [Member]        
Disclosure of detailed information about borrowings [line items]        
Borrowings, beginning balance   1,111.1 1,190.6 1,190.6
Repurchases   (102.5) (82.6)  
Write-down of unamortized transaction costs   0.2 0.6  
Accretion of transaction costs and premiums   2.1 2.5  
Borrowings, ending balance 1,111.1 1,010.9 1,111.1 1,010.9
Senior secured revolving credit facilities [Member]        
Disclosure of detailed information about borrowings [line items]        
Borrowings, beginning balance   (3.6) 96.9 96.9
Repayments     (100.0)  
Accretion of transaction costs and premiums   1.3 2.0  
Transaction costs (2.5)   (2.5)  
Borrowings, ending balance $ (3.6) $ (2.3) $ (3.6) $ (2.3)