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FAIR VALUE MEASUREMENTS (Tables)
12 Months Ended
Dec. 31, 2023
Fair Value Disclosures [Abstract]  
Schedule of Financial Instruments Measured at Fair Value on a Recurring Basis
The following table summarizes the Company's financial instruments which are measured at fair value on a recurring basis as of December 31, 2023 and 2022 (in millions):

December 31, 2023Level 1Level 2Level 3Total
Assets    
Cash equivalents$579.2 $— $— $579.2 
Available-for-sale investments: 
Corporate debt securities— 641.8 — 641.8 
Asset-backed securities— 184.3 — 184.3 
United States government and agency securities— 70.0 — 70.0 
Municipal securities— 2.6 — 2.6 
Investments held for deferred compensation plans125.8 — — 125.8 
Derivatives— 47.1 — 47.1 
$705.0 $945.8 $— $1,650.8 
Liabilities    
Derivatives$— $15.2 $— $15.2 
Other— — 10.3 10.3 
$— $15.2 $10.3 $25.5 
December 31, 2022
Assets
Cash equivalents$280.4 $— $— $280.4 
Available-for-sale investments: 
Corporate debt securities— 980.3 — 980.3 
Asset-backed securities— 366.6 — 366.6 
United States government and agency securities37.1 94.5 — 131.6 
Municipal securities— 2.5 — 2.5 
Investments held for deferred compensation plans112.1 — — 112.1 
Derivatives— 65.5 — 65.5 
$429.6 $1,509.4 $— $1,939.0 
Liabilities    
Derivatives$— $27.2 $— $27.2 
Contingent consideration liabilities— — 26.2 26.2 
Other— — 14.0 14.0 
$— $27.2 $40.2 $67.4 
Schedule of Changes in Fair Value of Contingent Consideration Obligation
The following table summarizes the changes in fair value of Level 3 financial instruments measured at fair value on a recurring basis for the years ended December 31, 2023 and 2022 (in millions):

Contingent ConsiderationOtherTotal
Fair value, December 31, 2021
$62.0 $14.0 $76.0 
Changes in fair value(35.8)— (35.8)
Fair value, December 31, 2022
$26.2 $14.0 $40.2 
Changes in fair value(26.2)(3.7)(29.9)
Fair value, December 31, 2023
$— $10.3 $10.3