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FAIR VALUE MEASUREMENTS (Tables)
12 Months Ended
Dec. 31, 2020
Fair Value Disclosures [Abstract]  
Summary 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, 2020 and 2019 (in millions):

December 31, 2020Level 1Level 2Level 3Total
Assets    
Cash equivalents$16.2 $— $— $16.2 
Available-for-sale investments: 
Bank time deposits— 24.1 — 24.1 
Corporate debt securities— 608.3 — 608.3 
Asset-backed securities— 151.5 — 151.5 
U.S. government and agency securities56.9 92.2 — 149.1 
Municipal securities— 2.8 — 2.8 
Investments held for deferred compensation plans111.2 — — 111.2 
Derivatives— 8.1 — 8.1 
$184.3 $887.0 $— $1,071.3 
Liabilities    
Derivatives$— $39.3 $— $39.3 
Deferred compensation plans111.6 — — 111.6 
Contingent consideration liabilities— — 186.1 186.1 
$111.6 $39.3 $186.1 $337.0 
December 31, 2019
Assets
Cash equivalents$0.7 $31.7 $— $32.4 
Available-for-sale investments: 
Bank time deposits— 13.1 — 13.1 
Corporate debt securities— 489.2 — 489.2 
Asset-backed securities— 141.7 — 141.7 
U.S. government and agency securities76.1 37.7 — 113.8 
Foreign government bonds— 1.7 — 1.7 
Commercial paper— 34.3 — 34.3 
Investments held for deferred compensation plans88.9 — — 88.9 
Derivatives— 30.7 — 30.7 
$165.7 $780.1 $— $945.8 
Liabilities    
Derivatives$— $6.4 $— $6.4 
Deferred compensation plans88.7 — — 88.7 
Contingent consideration liabilities— — 172.5 172.5 
$88.7 $6.4 $172.5 $267.6 
Summary of Changes in Fair Value of Contingent Consideration Obligation
The following table summarizes the changes in fair value of the contingent consideration obligation for the years ended December 31, 2020 and 2019 (in millions):

December 31,
20202019
Fair value, beginning of year$172.5 $178.6 
Changes in fair value13.6 (6.1)
Fair value, end of year$186.1 $172.5