v3.25.4
Investments - Changes in equity investments at FVTOCI and accumulated other comprehensive income (loss) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Accumulated other comprehensive income (loss)    
Balance at beginning $ (282.0)  
Income tax expense (106.0) $ (6.2)
Currency translation adjustment 91.2 (131.3)
Balance at ending 430.5 (282.0)
FVTOCI    
Financial assets at fair value through other comprehensive income [abstract]    
Balance at beginning 324.8 246.4
Cost of additions 76.1 103.2
Held during the year 717.3 38.5
Disposed during the year 85.0 8.1
Disposals (127.1) (45.5)
Impact of foreign exchange 29.2 (25.9)
Balance at ending 1,105.3 324.8
Equity investments at FVTOCI    
Balance at beginning 324.8 246.4
Held during the year 717.3 38.5
Disposed during the year 85.0 8.1
Gain on changes in the fair value of equity investments at FVTOCI 802.3 46.6
Additions 76.1 103.2
Disposals (127.1) (45.5)
Impact of foreign exchange 29.2 (25.9)
Balance at ending 1,105.3 324.8
Accumulated other comprehensive income (loss)    
Balance at beginning (282.0) (192.0)
Held during the period 717.3 38.5
Disposed during the period 85.0 8.1
Income tax expense (106.0) (6.2)
Gain on changes in the fair value of equity investments at FVOCI 696.3 40.4
Transfers within equity following disposal (75.0) 0.9
Currency translation adjustment 91.2 (131.3)
Balance at ending $ 430.5 $ (282.0)