Pension and Other Postemployment Benefits

9 Months Ended

Sep. 30, 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):

	Nine Months Ended September 30,
	2021		2020
Service cost	$	3.9	$	5.6
Interest cost	2.7		5.0
Expected return on plan assets	(0.8)		(0.7)
Amortization of prior service cost	0.5		0.5
Amortization of actuarial losses	7.0		4.0
	$	13.3	$	14.4

We contributed $0.5 million and $0.9 million to our defined benefit pension plans in the nine months ended September 30, 2021 and 2020, respectively.

Postemployment Arrangements

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

	Nine Months Ended September 30,
	2021		2020
Service cost	$	3.6	$	3.5
Interest cost	1.6		2.6
Amortization of prior service cost	3.1		3.2
Amortization of actuarial losses	2.9		1.6
	$	11.2	$	10.9