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Retirement benefits (Tables) | 6 Months Ended
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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 |

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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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