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Defined Benefit Pension Plans and Other Post-Employment Benefit Plans - Schedule of Net Period Benefit Costs (Income) for Post-retirement Employee Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Components of net periodic benefit cost: |  |  |  |
Interest cost | $ 6.3 | $ 6.7 | $ 18.9 | $ 20.3
Amortization of net prior service credit and net actuarial gain | 0.1 | 0.1 | 0.2 | 0.2
Net periodic benefit cost | 1.1 | 1.8 | 2.8 | 5.2
Other post-retirement employee benefit plans |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Interest cost | 0.3 | 0.4 | 1.0 | 1.1
Amortization of net prior service credit and net actuarial gain | (0.1) | 0.0 | (0.4) | (0.3)
Net periodic benefit cost | $ 0.2 | $ 0.4 | $ 0.6 | $ 0.8

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- Definition Defined benefit plan net periodic benefit cost income excluding settlements and curtailments. + References No definition available. + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 3A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480535/715-20-45-3A Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-18 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (h)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Subparagraph (a)(5) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-6 + Details
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