Pension and Other Postemployment Benefits

6 Months Ended

Jun. 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):

	Six Months Ended June 30,
	2021		2020
Service cost	$	2.7	$	4.0
Interest cost	1.5		2.5
Expected return on plan assets	(0.5)		(0.5)
Amortization of prior service cost	0.4		0.4
Amortization of actuarial losses	4.6		2.7
	$	8.7	$	9.1

We contributed $0.3 million and $0.5 million to our defined benefit pension plans in the six months ended June 30, 2021 and 2020, respectively.

Postemployment Arrangements

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

	Six Months Ended June 30,
	2021		2020
Service cost	$	2.4	$	2.3
Interest cost	1.1		1.7
Amortization of prior service cost	2.1		2.1
Amortization of actuarial losses	1.9		1.1
	$	7.5	$	7.2