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Investments (Tables)
12 Months Ended
Dec. 31, 2024
Subclassifications of assets, liabilities and equities [abstract]  
Investments
 December 31, 2024December 31, 2023
Fair
Value
CostAccumulated
unrealized
holding gains (losses)
Fair ValueCost
Accumulated
unrealized
holding gains
Investments$24.5 $34.9 $(10.4)$41.3 $37.3 $4.0