Retirement benefits (Tables)

6 Months Ended

Jun. 30, 2022

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs

The components of net periodic pension cost for our pension plans were as follows:

	U.S. Plans			Non-U.S. Plans		Total
(In millions)	2022		2021	2022	2021	2022	2021
Three months ended June 30,
Service cost	$	—	—	2.0	2.5	2.0	2.5
Interest cost on projected benefit obligation	5.7		5.3	3.3	3.1	9.0	8.4
Return on assets – expected	(12.3)		(11.9)	(3.4)	(3.1)	(15.7)	(15.0)
Amortization of losses	6.3		8.6	0.5	1.7	6.8	10.3
Amortization of prior service credit	—		—	—	(0.1)	—	(0.1)
Curtailment gain	—		—	—	(0.6)	—	(0.6)
Settlement loss	—		—	0.1	0.3	0.1	0.3
Net periodic pension cost	$	(0.3)	2.0	2.5	3.8	2.2	5.8
Six months ended June 30,
Service cost	$	—	—	4.1	4.7	4.1	4.7
Interest cost on projected benefit obligation	11.4		10.6	6.6	6.0	18.0	16.6
Return on assets – expected	(24.4)		(23.7)	(6.3)	(6.2)	(30.7)	(29.9)
Amortization of losses	12.1		17.0	1.0	3.3	13.1	20.3
Amortization of prior service cost	—		—	—	(0.1)	—	(0.1)
Curtailment gain	—		—	—	(0.6)	—	(0.6)
Settlement loss	—		—	0.5	0.7	0.5	0.7
Net periodic pension cost	$	(0.9)	3.9	5.9	7.8	5.0	11.7

Schedule of Costs of Retirement Plans

The components of net periodic postretirement cost related to retirement benefits other than pensions were as follows:

	UMWA Plans			Black Lung and Other Plans		Total
(In millions)	2022		2021	2022	2021	2022	2021
Three months ended June 30,
Service cost	$	—	—	0.1	0.1	0.1	0.1
Interest cost on accumulated postretirement benefit obligations	2.6		2.4	0.9	0.8	3.5	3.2
Return on assets – expected	(3.3)		(3.0)	—	—	(3.3)	(3.0)
Amortization of losses	2.2		4.2	1.8	2.3	4.0	6.5
Amortization of prior service cost	(1.1)		(1.1)	(0.1)	(0.2)	(1.2)	(1.3)
Net periodic postretirement cost	$	0.4	2.5	2.7	3.0	3.1	5.5
Six months ended June 30,
Service cost	$	—	—	0.1	0.1	0.1	0.1
Interest cost on accumulated postretirement benefit obligations	5.3		4.9	1.8	1.6	7.1	6.5
Return on assets – expected	(6.6)		(6.1)	—	—	(6.6)	(6.1)
Amortization of losses	5.3		9.0	3.7	4.4	9.0	13.4
Amortization of prior service cost	(2.3)		(2.3)	(0.1)	(0.2)	(2.4)	(2.5)
Net periodic postretirement cost	$	1.7	5.5	5.5	5.9	7.2	11.4