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Defined benefit plan (Tables)
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Net Benefit Costs The expense components of the Swiss Plan consisted of the following:
 
 
Three Months Ended June 30, 2019
 
Six months ended June 30, 2019
Net service cost
 
$
0.3

 
$
0.6

Expected return on plan assets, net of expenses
 
(0.1
)
 
(0.1
)
   Total pension expense
 
$
0.2

 
$
0.5