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Retirement benefits (Tables)
 6 Months Ended
Jun. 30, 2019
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)
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
 
 
 
 
 
 
 
 
 
 
 
Three months ended June 30,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
—

 
—

 
2.4

 
2.6

 
2.4

 
2.6

Interest cost on projected benefit obligation
8.6

 
8.0

 
2.6

 
3.3

 
11.2

 
11.3

Return on assets – expected
(12.7
)
 
(13.4
)
 
(2.6
)
 
(2.8
)
 
(15.3
)
 
(16.2
)
Amortization of losses
4.8

 
6.9

 
1.0

 
1.0

 
5.8

 
7.9

Amortization of prior service cost
—

 
—

 
0.1

 
—

 
0.1

 
—

Settlement loss
—

 
—

 
0.6

 
0.5

 
0.6

 
0.5

Net periodic pension cost
$
0.7

 
1.5

 
4.1

 
4.6

 
4.8

 
6.1

 
 
 
 
 
 
 
 
 
 
 
 
Six months ended June 30,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
—

 
—

 
4.9

 
5.6

 
4.9

 
5.6

Interest cost on projected benefit obligation
17.1

 
16.0

 
5.2

 
7.3

 
22.3

 
23.3

Return on assets – expected
(25.4
)
 
(26.8
)
 
(5.2
)
 
(5.7
)
 
(30.6
)
 
(32.5
)
Amortization of losses
9.8

 
14.0

 
2.0

 
2.3

 
11.8

 
16.3

Amortization of prior service cost
—

 
—

 
0.1

 
0.2

 
0.1

 
0.2

Settlement loss
—

 
—

 
0.9

 
1.0

 
0.9

 
1.0

Net periodic pension cost
$
1.5

 
3.2

 
7.9

 
10.7

 
9.4

 
13.9
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)
2019
 
2018
 
2019
 
2018
 
2019
 
2018
 
 
 
 
 
 
 
 
 
 
 
 
Three months ended June 30,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
—

 
—

 
0.1

 
0.1

 
0.1

 
0.1

Interest cost on accumulated postretirement benefit obligations
4.1

 
4.2

 
0.9

 
0.9

 
5.0

 
5.1

Return on assets – expected
(3.3
)
 
(4.2
)
 
—

 
—

 
(3.3
)
 
(4.2
)
Amortization of losses
3.8

 
5.0

 
1.2

 
1.5

 
5.0

 
6.5

Amortization of prior service (credit) cost
(1.2
)
 
(1.2
)
 
(0.1
)
 
0.3

 
(1.3
)
 
(0.9
)
Net periodic postretirement cost
$
3.4

 
3.8

 
2.1

 
2.8

 
5.5

 
6.6

 
 
 
 
 
 
 
 
 
 
 
 
Six months ended June 30,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
—

 
—

 
0.1

 
0.1

 
0.1

 
0.1

Interest cost on accumulated postretirement benefit obligations
9.1

 
8.7

 
1.8

 
1.6

 
10.9

 
10.3

Return on assets – expected
(6.6
)
 
(8.4
)
 
—

 
—

 
(6.6
)
 
(8.4
)
Amortization of losses
8.9

 
10.5

 
2.3

 
2.7

 
11.2

 
13.2

Amortization of prior service (credit) cost
(2.3
)
 
(2.3
)
 
(0.2
)
 
0.6

 
(2.5
)
 
(1.7
)
Net periodic postretirement cost
$
9.1

 
8.5

 
4.0

 
5.0

 
13.1

 
13.5