Pension and Postretirement Benefit Plans

9 Months Ended

Sep. 30, 2020

Retirement Benefits [Abstract]

Pension and Postretirement Benefit Plans

PENSION AND POSTRETIREMENT BENEFIT PLANS

    Net periodic pension and postretirement benefit cost for the Company’s defined pension and postretirement benefit plans for the three and nine months ended September 30, 2020 and 2019 are set forth below (in millions):

	Three Months Ended September 30,				Nine Months Ended September 30,
Pension benefits	2020		2019		2020		2019
Service cost	$	4.0	$	3.9	$	12.0	$	11.7
Interest cost	4.1		5.1		12.3		15.7
Expected return on plan assets	(7.1)		(6.8)		(21.2)		(21.1)
Amortization of net actuarial losses	3.4		2.9		10.0		9.0
Amortization of prior service cost	0.5		0.4		1.6		1.2
Net periodic pension cost	$	4.9	$	5.5	$	14.7	$	16.5

	Three Months Ended September 30,				Nine Months Ended September 30,
Postretirement benefits	2020		2019		2020		2019
Service cost	$	—	$	0.1	$	—	$	0.1
Interest cost	0.3		0.3		0.9		1.0
Amortization of net actuarial losses	0.1		—		0.2		—
Amortization of prior service cost	—		—		0.1		0.1
Net periodic postretirement benefit cost	$	0.4	$	0.4	$	1.2	$	1.2

    The components of net periodic pension and postretirement benefits cost, other than the service cost component, are included in “Other expense, net” in the Company’s Condensed Consolidated Statements of Operations.

    The following table summarizes the activity in accumulated other comprehensive loss related to the Company’s defined pension and postretirement benefit plans during the nine months ended September 30, 2020 (in millions):

	Before-Tax Amount		Income Tax		After-Tax Amount
Accumulated other comprehensive loss as of December 31, 2019	$	(393.2)	$	(96.8)	$	(296.4)
Amortization of net actuarial losses	10.2		1.5		8.7
Amortization of prior service cost	1.7		0.1		1.6
Accumulated other comprehensive loss as of September 30, 2020	$	(381.3)	$	(95.2)	$	(286.1)

    During the nine months ended September 30, 2020, the Company made approximately $23.8 million of contributions to its defined pension benefit plans. The Company currently estimates its minimum contributions for 2020 to its defined pension benefit plans will aggregate approximately $32.5 million.

    During the nine months ended September 30, 2020, the Company made approximately $1.1 million of contributions to its postretirement health care and life insurance benefit plans. The Company currently estimates that it will make approximately $1.6 million of contributions to its postretirement health care and life insurance benefit plans during 2020.