Pension and Other Postemployment Benefits

3 Months Ended

Mar. 31, 2021

Pension and Other Postemployment Benefits [Abstract]

Pension and Other Postemployment Benefits

Pension and Other Postemployment Benefits

Defined Benefit Pension Plans

The components of net periodic benefit expense were (in millions):

	Three Months Ended March 31,
	2021		2020
Service cost	$	1.4	$	2.0
Interest cost	0.8		1.3
Expected return on plan assets	(0.2)		(0.3)
Amortization of prior service cost	0.2		0.2
Amortization of actuarial losses	2.3		1.4
	$	4.5	$	4.6

We contributed $0.2 million and $0.1 million to our defined benefit pension plans in the three months ended March 31, 2021 and 2020, respectively.

Postemployment Arrangements

The components of net periodic benefit expense were (in millions):

	Three Months Ended March 31,
	2021		2020
Service cost	$	1.2	$	1.2
Interest cost	0.5		0.9
Amortization of prior service cost	1.0		1.1
Amortization of actuarial losses	1.0		0.5
	$	3.7	$	3.7