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Investments (Tables)
 12 Months Ended
Dec. 31, 2024
Fair Value Disclosures [Abstract]  
Schedule of Investments We classify our investment portfolio as shown below:
 
As of December 31,
(in millions)20242023
Equity investments$42.3 $44.9 
Available-for-sale2.4 2.2 
Held-to-maturity3.6 4.0 
Total$48.3 $51.1 
Unrealized Gain (Loss) on Investments
The following table shows the cost, unrealized gains, and fair values related to investments classified as equity investments, available-for-sale, and held-to-maturity:
 As of December 31, 2024As of December 31, 2023
(in millions)CostUnrealized
Gain		Unrealized
Loss		Fair
Value		CostUnrealized
Gain		Unrealized
Loss		Fair
Value
Equity investments:        
Marketable equity investments, exchange traded funds, and mutual funds$29.1 $13.2 $— $42.3 $37.7 $7.2 $— $44.9 
Available-for-sale:
Marketable debt securities2.6 — (0.2)2.4 2.3 — (0.1)2.2 
Held-to-maturity:
Certificates of deposit3.6 — — 3.6 4.0 — — 4.0 
Total$35.3 $13.2 $(0.2)$48.3 $44.0 $7.2 $(0.1)$51.1 
Investments Classified by Contractual Maturity Date
The table below shows the cost and fair value of investments classified as held-to-maturity based on their contractual maturities as of December 31, 2024 and 2023.
 As of December 31, 2024As of December 31, 2023
(in millions)CostFair ValueCostFair Value
Held-to-maturity:    
Due in one year or less$3.6 $3.6 $4.0 $4.0 
Due in one to three years— — — — 
Total$3.6 $3.6 $4.0 $4.0 
Schedule of Realized Gain (Loss)
The following table shows the realized gains and losses arising from sales of our investments classified as equity investments and available-for-sale recorded in our Consolidated Statements of Income: 
(in millions)202420232022
Realized gains$3.8 $2.9 $1.0 
Realized losses— — (3.1)
Realized gains (losses), net$3.8 $2.9 $(2.1)
Unrealized Gain Loss On Trading Securities
The following table shows the net unrealized gains on the equity securities as recorded in our Consolidated Statements of Income:

 
(in millions)202420232022
Unrealized gains, net$0.9 $4.2 $5.4