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Investments (Tables)
12 Months Ended
Dec. 31, 2023
Subclassifications of assets, liabilities and equities [abstract]  
Investments
 December 31, 2023December 31, 2022
Fair
Value
Cost
Accumulated
unrealized
holding gains
Fair ValueCost
Accumulated
unrealized
holding gains
Investments$41.3 $37.3 $4.0 $35.3 $20.8 $14.5