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Revenue recognition - Performance Obligations (Details) - USD ($)
$ in Millions
Jun. 30, 2020
Dec. 31, 2019
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Contract with Customer, Liability   $ 11.7
Deferred consideration payable   $ 11.7
Revenue, performance obligation, period   1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-07-01    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]    
Contract with Customer, Liability $ 7.7  
Deferred consideration payable $ 7.7  
Revenue, performance obligation, period 1 year