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Retirement benefits (Tables)
 6 Months Ended
Jun. 30, 2020
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)
2020
 
2019
 
2020
 
2019
 
2020
 
2019
 
 
 
 
 
 
 
 
 
 
 
 
Three months ended June 30,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
—

 
—

 
3.0

 
2.4

 
3.0

 
2.4

Interest cost on projected benefit obligation
6.7

 
8.6

 
2.9

 
2.6

 
9.6

 
11.2

Return on assets – expected
(11.6
)
 
(12.7
)
 
(3.1
)
 
(2.6
)
 
(14.7
)
 
(15.3
)
Amortization of losses
7.2

 
4.8

 
1.2

 
1.0

 
8.4

 
5.8

Amortization of prior service credit
—

 
—

 
—

 
0.1

 
—

 
0.1

Settlement loss
—

 
—

 
0.1

 
0.6

 
0.1

 
0.6

Net periodic pension cost
$
2.3

 
0.7

 
4.1

 
4.1

 
6.4

 
4.8

 
 
 
 
 
 
 
 
 
 
 
 
Six months ended June 30,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
—

 
—

 
5.9

 
4.9

 
5.9

 
4.9

Interest cost on projected benefit obligation
13.3

 
17.1

 
5.3

 
5.2

 
18.6

 
22.3

Return on assets – expected
(23.1
)
 
(25.4
)
 
(5.7
)
 
(5.2
)
 
(28.8
)
 
(30.6
)
Amortization of losses
14.1

 
9.8

 
2.4

 
2.0

 
16.5

 
11.8

Amortization of prior service cost
—

 
—

 
—

 
0.1

 
—

 
0.1

Settlement loss
—

 
—

 
0.5

 
0.9

 
0.5

 
0.9

Net periodic pension cost
$
4.3

 
1.5

 
8.4

 
7.9

 
12.7

 
9.4
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)
2020
 
2019
 
2020
 
2019
 
2020
 
2019
 
 
 
 
 
 
 
 
 
 
 
 
Three months ended June 30,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
—

 
—

 
0.1

 
0.1

 
0.1

 
0.1

Interest cost on accumulated postretirement benefit obligations
3.1

 
4.1

 
1.0

 
0.9

 
4.1

 
5.0

Return on assets – expected
(3.2
)
 
(3.3
)
 
—

 
—

 
(3.2
)
 
(3.3
)
Amortization of losses
4.1

 
3.8

 
2.1

 
1.2

 
6.2

 
5.0

Amortization of prior service (credit) cost
(1.1
)
 
(1.2
)
 
(0.2
)
 
(0.1
)
 
(1.3
)
 
(1.3
)
Net periodic postretirement cost
$
2.9

 
3.4

 
3.0

 
2.1

 
5.9

 
5.5

 
 
 
 
 
 
 
 
 
 
 
 
Six months ended June 30,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
$
—

 
—

 
0.1

 
0.1

 
0.1

 
0.1

Interest cost on accumulated postretirement benefit obligations
6.4

 
9.1

 
1.9

 
1.8

 
8.3

 
10.9

Return on assets – expected
(6.5
)
 
(6.6
)
 
—

 
—

 
(6.5
)
 
(6.6
)
Amortization of losses
8.1

 
8.9

 
4.1

 
2.3

 
12.2

 
11.2

Amortization of prior service credit
(2.3
)
 
(2.3
)
 
(0.2
)
 
(0.2
)
 
(2.5
)
 
(2.5
)
Net periodic postretirement cost
$
5.7

 
9.1

 
5.9

 
4.0

 
11.6

 
13.1