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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Interest cost | $ 3.9 | $ 3.1 | $ 12.0 | $ 9.2
Amortization of net prior service credit | 0.1 | 0.1 | 0.2 | 0.2
Amortization of net actuarial gain | 1.5 | 2.0 | 4.2 | 5.8
Net periodic (income) cost | (0.5) | (0.4) | (1.8) | (1.4)
Other employee benefit plans |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Interest cost | 0.2 | 0.1 | 0.6 | 0.4
Amortization of net prior service credit | 0.0 | 0.0 | (0.2) | (0.2)
Amortization of net actuarial gain | (0.1) | 0.0 | (0.1) | (0.1)
Net periodic (income) cost | $ 0.1 | $ 0.1 | $ 0.3 | $ 0.1

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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI https://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI https://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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