XML 125 R170.htm IDEA: XBRL DOCUMENT v3.19.3
Revenue from contracts with customers - Revenue streams - Parenthetical (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Intersegment Transaction        
Revenue From Contract With Customer Excluding Assessed Tax $ 0.2 $ 0.2 $ 2.3 $ 1.9