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Fair value measurements (Tables)
 12 Months Ended
Dec. 31, 2018
Fair value measurements [Abstract]  
Reconciliation of Liabilities Measured at Fair Value Using Significant Unobservable Inputs (Level 3)
The following table is a reconciliation of the beginning and ending balance of the contingent consideration liabilities measured at fair value using significant unobservable inputs (Level 3) during the years ended December 31, 2018 and 2017.

(in millions)
   
Balance at December 31, 2016
 
$
13.2
 
(Income) expense included in earnings
  
7.8
 
Settlements
  
(10.9
)
Additions due to acquisition
  
2.2
 
Balance at December 31, 2017
 
$
12.3
 
(Income) expense included in earnings
  
3.1
 
Settlements
  
(3.4
)
Additions due to acquisition
  
48.0
 
Balance at December 31, 2018
 
$
60.0