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v3.23.3

Defined Benefit Pension Plans and Other Post-Employment Benefit Plans - Net Period Benefit Costs (Income) for Post-retirement Employee Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Components of net periodic benefit cost: |  |  |  |
Interest cost | $ 7.0 | $ 3.9 | $ 21.0 | $ 12.0
Amortization of net prior service credit | 0.1 | 0.1 | 0.2 | 0.2
Amortization of net actuarial gain | (1.2) | (1.5) | (3.6) | (4.2)
Net periodic cost (income) | 2.1 | (0.5) | 6.0 | (1.8)
Other post-retirement employee benefit plans |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Interest cost | 0.4 | 0.2 | 1.2 | 0.6
Amortization of net prior service credit | (0.1) | 0.0 | (0.2) | (0.2)
Amortization of net actuarial gain | 0.0 | 0.1 | 0.1 | 0.1
Net periodic cost (income) | $ 0.3 | $ 0.1 | $ 0.9 | $ 0.3

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- Definition Amount of gain (loss) 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)(4) -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)(4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-6 + Details
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