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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Components of net periodic benefit cost: |  |  |  |
Interest cost | $ 6.9 | $ 7.0 | $ 13.6 | $ 14.0
Amortization of net prior service credit and net actuarial gain |  |  | 0.1 | 0.1
Net periodic benefit cost | 1.8 | 1.9 | 3.4 | 3.9
Other post-retirement employee benefit plans |  |  |  |
Components of net periodic benefit cost: |  |  |  |
Interest cost | 0.3 | 0.4 | 0.7 | 0.8
Amortization of net prior service credit and net actuarial gain | (0.2) | (0.1) | (0.3) | (0.2)
Net periodic benefit cost | $ 0.1 | $ 0.3 | $ 0.4 | $ 0.6

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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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