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Pension Benefit Obligations (Tables) | 3 Months Ended
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Dec. 31, 2023
Pension Benefit Obligations |
Schedule of components of net periodic cost for the Company's pension and post-retirement plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended
​ | ​ | December 31, 2023 | ​ | December 31, 2022
​ |  | U.S. |  | Int’l |  | U.S. |  | Int’l
​ | ​ | (in millions)
Components of net periodic benefit cost: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Service costs | ​ | $ | — | ​ | $ | 0.1 | ​ | $ | — | ​ | $ | 0.1
Interest cost on projected benefit obligation | ​ |  | 2.4 | ​ | ​ | 10.7 | ​ | ​ | 2.5 | ​ | ​ | 11.5
Expected return on plan assets | ​ |  | (1.4) | ​ | ​ | (14.1) | ​ | ​ | (1.5) | ​ | ​ | (14.7)
Amortization of net loss/(gain) | ​ |  | 0.8 | ​ | ​ | (0.6) | ​ | ​ | 0.9 | ​ | ​ | (0.1)
Net periodic benefit cost (credit) | ​ | $ | 1.8 | ​ | $ | (3.9) | ​ | $ | 1.9 | ​ | $ | (3.2)

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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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