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Income taxes - Recognized in OCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income taxes    
Gain (loss) on change in the fair value of equity investments of FVTOCI $ 11.4 $ (21.4)
Cumulative translation adjustment 32.3 (68.3)
Other comprehensive income (loss) 43.7 (89.7)
Gain (loss) on change in the fair value of equity investments at FVTOCI (1.5) 3.0
Other comprehensive income (loss) (1.5) 3.0
Deferred tax (1.5) 3.0
Gain (loss) on change in the fair value equity investments at FVTOCI 9.9 (18.4)
Cumulative translation adjustment 32.3 (68.3)
Other comprehensive income (loss) $ 42.2 $ (86.7)