Employee benefit plans (Tables)

9 Months Ended

Sep. 30, 2020

Postemployment Benefits [Abstract]

Components of Net Periodic (Benefit) Cost

The following table summarizes the components of net periodic (benefit) cost recognized in the condensed consolidated statements of operations:

	Domestic - Defined Benefit Pension Plans								Foreign - Defined Benefit Pension Plans
	Three months ended September 30,				Nine months ended September 30,				Three months ended September 30,				Nine months ended September 30,
(in millions)	2020		2019		2020		2019		2020		2019		2020		2019
Service cost (1)	$	—	$	—	$	—	$	—	$	0.5	$	0.6	$	1.4	$	1.8
Interest cost (2)	5.8		6.8		17.4		20.4		3.2		3.9		9.3		11.7
Expected return on plan assets (2)	(7.1)		(6.3)		(21.4)		(18.9)		(4.1)		(4.9)		(11.9)		(15.0)
Prior service cost (2)	—		—		—		—		—		—		0.1		0.1
Net periodic (benefit) cost	$	(1.3)	$	0.5	$	(4.0)	$	1.5	$	(0.4)	$	(0.4)	$	(1.1)	$	(1.4)

(1)Service cost is included in warehouse, selling and administrative expenses.

(2)These amounts are included in other income (expense), net.