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Income taxes - Recognized in OCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income taxes    
Gain (loss) on change in the fair value of equity investments of FVTOCI $ 50.5 $ 11.4
Currency translation adjustment 19.6 32.3
Other comprehensive income (loss) 70.1 43.7
Gain (loss) on change in the fair value of equity investments at FVTOCI (6.7) (1.5)
Other comprehensive income (loss) (6.7) (1.5)
Deferred tax (6.7) (1.5)
Tax expense in other comprehensive income (6.7) (1.5)
Gain (loss) on change in the fair value equity investments at FVTOCI 43.8 9.9
Currency translation adjustment 19.6 32.3
Other comprehensive income $ 63.4 $ 42.2