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Other Income, Net - Components of Other income, Net (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Other Income and Expenses [Abstract] |  |  |
Interest income |  | $ 0.9 | $ 0.4
Net periodic postretirement benefit cost |  | (0.3) | (2.0)
Unrealized gain on equity securities |  | 0.2 | 0.1
(Loss) gain on disposition of property, plant and equipment |  | (0.2) | 15.0
Gain on business interruption insurance recoveries | [1] | 10.5 | 0.0
All other, net |  | (0.2) | 0.1
Other income, net |  | $ 10.9 | $ 13.6
[1] | Represents advances against business interruption insurance claims. We recognize such advances in the period in which the insurance proceeds are received or become realizable. As of March 31, 2024, we received net cash proceeds of $9.7 million on the $10.5 million total gain recognized to date.

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- Definition Amount of unrealized and realized gain (loss) on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(3)(d)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 321 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479536/321-10-50-4 + Details
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- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
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- Definition The net amount (to the extent disclosed within this portion of the income statement) by which an insurance settlement exceeds incremental costs incurred from the event causing an interruption of business, plus the insurance award for earnings lost from the event, such as a natural catastrophe, explosion or fire. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483605/220-30-50-1 + Details
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