Defined benefit plan (Tables)

9 Months Ended

Sep. 30, 2019

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

The expense components of the Swiss Plan consisted of the following:

	Three Months Ended September 30, 2019			Nine Months Ended September 30, 2019
Net service cost	$	0.3		$	1.0
Expected return on plan assets, net of expenses	(0.1		)	(0.4		)
Total pension expense	$	0.2		$	0.6