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FAIR VALUE MEASUREMENTS (Tables)
3 Months Ended
Mar. 31, 2021
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 (in millions):
March 31, 2021Level 1Level 2Level 3Total
Assets    
Cash equivalents$10.9 $15.0 $— $25.9 
Available-for-sale investments:
Bank time deposits
— 14.1 — 14.1 
Corporate debt securities
— 603.8 — 603.8 
Asset-backed securities
— 162.2 — 162.2 
U.S. government and agency securities
55.8 82.3 — 138.1 
Municipal securities
— 2.8 — 2.8 
Investments held for deferred compensation plans113.4 — — 113.4 
Derivatives— 28.8 — 28.8 
$180.1 $909.0 $— $1,089.1 
Liabilities    
Derivatives$— $16.1 $— $16.1 
Deferred compensation plans113.0 — — 113.0 
Contingent consideration liabilities— — 181.6 181.6 
$113.0 $16.1 $181.6 $310.7 
December 31, 2020    
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 securities
56.9 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 
Summary of Changes in Fair Value of Contingent Consideration Obligation
The following table summarizes the changes in fair value of the contingent consideration liabilities (in millions):

Three Months Ended
March 31,
 20212020
Balance at December 31$186.1 $172.5 
Changes in fair value(4.5)(2.2)
Balance at March 31$181.6 $170.3