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Defined benefit pension plans (Tables) | 6 Months Ended
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Jun. 30, 2024
Defined Benefit Pension Plans |
Defined benefit pension plans [Line Items] |
Components of Net Periodic Defined Benefit Cost | The components of our net periodic defined benefit pension cost are presented in the table below.
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​ | ​ | Three months ended | ​ | Six months ended
​ | ​ | June 30, | ​ | June 30,
​ |  | 2023 |  | 2024 |  | 2023 |  | 2024
​ | ​ | (In millions)
Service cost | ​ | $ | 1.5 | ​ | $ | 1.6 | ​ | $ | 3.1 | ​ | $ | 3.3
Interest cost | ​ | ​ | 5.5 | ​ | ​ | 5.2 | ​ | ​ | 11.1 | ​ | ​ | 10.6
Expected return on plan assets | ​ |  | (5.2) | ​ |  | (5.6) | ​ |  | (10.4) | ​ |  | (11.2)
Recognized net actuarial losses | ​ |  | 1.0 | ​ |  | 1.0 | ​ |  | 1.9 | ​ |  | 1.9
Settlements | ​ | ​ | 6.2 | ​ | ​ | — | ​ | ​ | 6.2 | ​ | ​ | —
Total | ​ | $ | 9.0 | ​ | $ | 2.2 | ​ | $ | 11.9 | ​ | $ | 4.6

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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 -Topic 715 -SubTopic 20 -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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