Retirement benefits (Tables)

9 Months Ended

Sep. 30, 2015

Compensation and Retirement Disclosure [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)	2015			2014		2015		2014		2015		2014
Three months ended September 30,
Service cost	$	—		—		2.6		3.1		2.6		3.1
Interest cost on projected benefit obligation	9.0			11.3		2.9		4.5		11.9		15.8
Return on assets – expected	(13.6		)	(16.2	)	(2.4	)	(3.7	)	(16.0	)	(19.9	)
Amortization of losses	7.7			7.0		1.1		0.6		8.8		7.6
Amortization of prior service cost	—			—		—		0.2		—		0.2
Settlement loss	—			—		1.5		2.4		1.5		2.4
Net periodic pension cost	$	3.1		2.1		5.7		7.1		8.8		9.2
Included in:
Continuing operations	$	3.1		2.1		5.7		6.6		8.8		8.7
Discontinued operations	—			—		—		0.5		—		0.5
Net periodic pension cost	$	3.1		2.1		5.7		7.1		8.8		9.2
Nine months ended September 30,
Service cost	$	—		—		8.1		9.8		8.1		9.8
Interest cost on projected benefit obligation	27.0			34.0		9.1		14.9		36.1		48.9
Return on assets – expected	(40.9		)	(47.8	)	(7.2	)	(11.3	)	(48.1	)	(59.1	)
Amortization of losses	23.2			21.2		3.6		1.7		26.8		22.9
Amortization of prior service cost	—			—		0.2		0.6		0.2		0.6
Settlement loss	—			—		4.9		4.2		4.9		4.2
Net periodic pension cost	$	9.3		7.4		18.7		19.9		28.0		27.3
Included in:
Continuing operations	$	9.3		7.4		17.6		18.5		26.9		25.9
Discontinued operations	—			—		1.1		1.4		1.1		1.4
Net periodic pension cost	$	9.3		7.4		18.7		19.9		28.0		27.3

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)	2015			2014		2015	2014	2015		2014
Three months ended September 30,
Service cost	$	—		—		—	—	—		—
Interest cost on accumulated postretirement benefit obligations	4.2			4.4		0.7	0.6	4.9		5.0
Return on assets – expected	(5.1		)	(5.6	)	—	—	(5.1	)	(5.6	)
Amortization of losses	3.7			2.9		0.8	0.2	4.5		3.1
Amortization of prior service (credit) cost	(1.1		)	(1.2	)	0.5	0.4	(0.6	)	(0.8	)
Net periodic postretirement cost	$	1.7		0.5		2.0	1.2	3.7		1.7
Nine months ended September 30,
Service cost	$	—		—		0.1	0.1	0.1		0.1
Interest cost on accumulated postretirement benefit obligations	12.9			13.6		2.1	1.6	15.0		15.2
Return on assets – expected	(15.4		)	(16.8	)	—	—	(15.4	)	(16.8	)
Amortization of losses	11.7			9.5		2.3	0.5	14.0		10.0
Amortization of prior service (credit) cost	(3.4		)	(3.5	)	1.4	1.3	(2.0	)	(2.2	)
Net periodic postretirement cost	$	5.8		2.8		5.9	3.5	11.7		6.3