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Acquisitions and disposals - Net Cash Flows on Purchase of Business (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Payments to Acquire Businesses, Net of Cash Acquired [Abstract]      
Consideration paid $ 0.0 $ (4.3)  
Proceeds from sale of businesses and other 0.0 0.1 $ 0.0
Acquisition and disposal costs paid 0.0 (0.5)  
Cash acquired 2.7 0.0  
Net cash flows on purchase of business 2.7 (4.7) (0.3)
Deferred consideration paid $ (0.8) $ (1.4) $ 0.0