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Other Income, Net - Components of Other Income, Net (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Other Income and Expenses [Abstract]        
Interest income $ 0.2 $ 0.9 $ 0.6 $ 3.0
Net periodic postretirement and postemployment benefit cost (1.2) (1.5) (3.8) (3.3)
Unrealized gain on equity securities 0.3 0.2 0.4 0.5
Gain on disposition of non-operating property, plant and equipment 10.3 4.4 10.3 3.9
Gain on business interruption insurance recoveries [1] 1.6 4.6 6.6 15.1
All other, net 0.2 0.1 0.3 (0.1)
Other Income, net $ 11.4 $ 8.7 $ 14.4 $ 19.1
[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. During the nine months ended September 30, 2025 and September 30, 2024, we received net cash proceeds of $6.4 million and $13.4 million, respectively.