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Fair Value of Financial Instruments (Tables)
9 Months Ended
Sep. 30, 2025
Fair Value Disclosures [Abstract]  
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis
The following tables summarize our financial assets and liabilities that are measured at fair value on a recurring basis and the fair value measurements, by level, within the fair value hierarchy as of September 30, 2025 and December 31, 2024:
 Fair Value Measurements Using:
As of September 30, 2025Fair ValueQuoted Prices in
Active Markets
(Level 1)
Significant Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
(in millions)
Assets:
Investments—guaranteed income fund$0.9 $ $ $0.9 
Investments—mutual funds and other15.9 15.9   
Total investments16.8 15.9  0.9 
Derivative assets0.1  0.1  
Total assets$16.9 $15.9 $0.1 $0.9 
Liabilities:
Derivative liabilities$1.8 $ $1.8 $ 
 
 Fair Value Measurements Using:
As of December 31, 2024Fair ValueQuoted Prices in
Active Markets
(Level 1)
Significant Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
(in millions)
Assets:
Investments—guaranteed income fund$1.1 $— $— $1.1 
Investments—mutual funds and other13.3 13.3 — — 
Total investments14.4 13.3 — 1.1 
Derivative assets 0.7 — 0.7 — 
Total assets$15.1 $13.3 $0.7 $1.1 
Liabilities:
Derivative liabilities $0.1 $— $0.1 $— 
Summary of Changes in Fair Value of Investments The changes in the fair value of Level 3 investments for the nine months ended September 30, 2025 and 2024 were not material.