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Revenue from contracts with customers - Revenue streams - Parenthetical (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Intersegment Transaction        
Revenue From Contract With Customer Excluding Assessed Tax $ (0.6) $ 0.3 $ 4.4 $ 2.6