v3.20.1
Income taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Components of income tax expenses (benefit)    
Current income tax expense $ 1.2 $ 1.3
Deferred income tax expense (benefit) 0.3 (0.7)
Total income tax expense, net $ 1.5 $ 0.6