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Retirement benefits (Tables)
 9 Months Ended
Sep. 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 September 30,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
—

 
—

 
2.5

 
2.6

 
2.5

 
2.6

Interest cost on projected benefit obligation
8.5

 
8.0

 
2.6

 
2.5

 
11.1

 
10.5

Return on assets – expected
(12.6
)
 
(13.4
)
 
(2.5
)
 
(2.7
)
 
(15.1
)
 
(16.1
)
Amortization of losses
4.9

 
6.8

 
1.1

 
1.0

 
6.0

 
7.8

Amortization of prior service credit
—

 
—

 
(0.1
)
 
—

 
(0.1
)
 
—

Settlement loss
—

 
—

 
0.6

 
0.4

 
0.6

 
0.4

Net periodic pension cost
$
0.8

 
1.4

 
4.2

 
3.8

 
5.0

 
5.2

 
 
 
 
 
 
 
 
 
 
 
 
Nine months ended September 30,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
—

 
—

 
7.4

 
8.2

 
7.4

 
8.2

Interest cost on projected benefit obligation
25.6

 
24.0

 
7.8

 
9.8

 
33.4

 
33.8

Return on assets – expected
(38.0
)
 
(40.2
)
 
(7.7
)
 
(8.4
)
 
(45.7
)
 
(48.6
)
Amortization of losses
14.7

 
20.8

 
3.1

 
3.3

 
17.8

 
24.1

Amortization of prior service cost
—

 
—

 
—

 
0.2

 
—

 
0.2

Settlement loss
—

 
—

 
1.5

 
1.4

 
1.5

 
1.4

Net periodic pension cost
$
2.3

 
4.6

 
12.1

 
14.5

 
14.4

 
19.1
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 September 30,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest cost on accumulated postretirement benefit obligations
$
4.1

 
4.2

 
0.9

 
0.7

 
5.0

 
4.9

Return on assets – expected
(3.4
)
 
(4.1
)
 
—

 
—

 
(3.4
)
 
(4.1
)
Amortization of losses
3.9

 
4.9

 
1.2

 
1.6

 
5.1

 
6.5

Amortization of prior service (credit) cost
(1.2
)
 
(1.2
)
 
(0.1
)
 
0.2

 
(1.3
)
 
(1.0
)
Net periodic postretirement cost
$
3.4

 
3.8

 
2.0

 
2.5

 
5.4

 
6.3

 
 
 
 
 
 
 
 
 
 
 
 
Nine months ended September 30,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
—

 
—

 
0.1

 
0.1

 
0.1

 
0.1

Interest cost on accumulated postretirement benefit obligations
13.2

 
12.9

 
2.7

 
2.3

 
15.9

 
15.2

Return on assets – expected
(10.0
)
 
(12.5
)
 
—

 
—

 
(10.0
)
 
(12.5
)
Amortization of losses
12.8

 
15.4

 
3.5

 
4.3

 
16.3

 
19.7

Amortization of prior service (credit) cost
(3.5
)
 
(3.5
)
 
(0.3
)
 
0.8

 
(3.8
)
 
(2.7
)
Net periodic postretirement cost
$
12.5

 
12.3

 
6.0

 
7.5

 
18.5

 
19.8