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Retirement benefits (Tables)
 6 Months Ended
Jun. 30, 2018
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)
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
 
 
 
 
Three months ended June 30,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
—

 
—

 
2.6

 
2.8

 
2.6

 
2.8

Interest cost on projected benefit obligation
8.0

 
8.8

 
3.3

 
4.3

 
11.3

 
13.1

Return on assets – expected
(13.4
)
 
(13.3
)
 
(2.8
)
 
(2.4
)
 
(16.2
)
 
(15.7
)
Amortization of losses
6.9

 
6.1

 
1.0

 
1.3

 
7.9

 
7.4

Amortization of prior service cost
—

 
—

 
—

 
0.2

 
—

 
0.2

Settlement loss
—

 
—

 
0.5

 
0.5

 
0.5

 
0.5

Net periodic pension cost
$
1.5

 
1.6

 
4.6

 
6.7

 
6.1

 
8.3

 
 
 
 
 
 
 
 
 
 
 
 
Six months ended June 30,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
—

 
—

 
5.6

 
5.7

 
5.6

 
5.7

Interest cost on projected benefit obligation
16.0

 
17.6

 
7.3

 
9.1

 
23.3

 
26.7

Return on assets – expected
(26.8
)
 
(26.6
)
 
(5.7
)
 
(4.8
)
 
(32.5
)
 
(31.4
)
Amortization of losses
14.0

 
12.4

 
2.3

 
2.6

 
16.3

 
15.0

Amortization of prior service cost
—

 
—

 
0.2

 
0.4

 
0.2

 
0.4

Settlement loss
—

 
—

 
1.0

 
0.8

 
1.0

 
0.8

Net periodic pension cost
$
3.2

 
3.4

 
10.7

 
13.8

 
13.9

 
17.2
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)
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
 
 
 
 
 
 
 
 
 
 
 
Three months ended June 30,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
—

 
—

 
0.1

 
0.1

 
0.1

 
0.1

Interest cost on accumulated postretirement benefit obligations
4.2

 
4.7

 
0.9

 
0.8

 
5.1

 
5.5

Return on assets – expected
(4.2
)
 
(4.1
)
 
—

 
—

 
(4.2
)
 
(4.1
)
Amortization of losses
5.0

 
5.0

 
1.5

 
1.1

 
6.5

 
6.1

Amortization of prior service (credit) cost
(1.2
)
 
(1.2
)
 
0.3

 
0.3

 
(0.9
)
 
(0.9
)
Net periodic postretirement cost
$
3.8

 
4.4

 
2.8

 
2.3

 
6.6

 
6.7

 
 
 
 
 
 
 
 
 
 
 
 
Six months ended June 30,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
—

 
—

 
0.1

 
0.1

 
0.1

 
0.1

Interest cost on accumulated postretirement benefit obligations
8.7

 
9.1

 
1.6

 
1.5

 
10.3

 
10.6

Return on assets – expected
(8.4
)
 
(8.3
)
 
—

 
—

 
(8.4
)
 
(8.3
)
Amortization of losses
10.5

 
9.4

 
2.7

 
2.0

 
13.2

 
11.4

Amortization of prior service (credit) cost
(2.3
)
 
(2.3
)
 
0.6

 
0.8

 
(1.7
)
 
(1.5
)
Net periodic postretirement cost
$
8.5

 
7.9

 
5.0

 
4.4

 
13.5

 
12.3