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FAIR VALUE MEASUREMENTS (Tables)
6 Months Ended
Jun. 30, 2019
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):
June 30, 2019
Level 1
 
Level 2
 
Level 3
 
Total
Assets
 

 
 

 
 

 
 

Cash equivalents
$
0.1

 
$
18.7

 
$

 
$
18.8

Available-for-sale investments:
 
 
 
 
 
 


Corporate debt securities

 
419.2

 

 
419.2

Asset-backed securities

 
81.2

 

 
81.2

U.S. government and agency securities
45.3

 
36.0

 

 
81.3

Foreign government bonds

 
1.7

 

 
1.7

Commercial paper

 
10.9

 

 
10.9

Municipal securities

 
2.7

 

 
2.7

Investments held for deferred compensation plans
79.7

 

 

 
79.7

Derivatives

 
18.6

 

 
18.6

 
$
125.1

 
$
589.0

 
$

 
$
714.1

Liabilities
 

 
 

 
 

 
 

Derivatives
$

 
$
4.6

 
$

 
$
4.6

Deferred compensation plans
80.0

 

 

 
80.0

Contingent consideration liabilities

 

 
193.3

 
193.3

 
$
80.0

 
$
4.6

 
$
193.3

 
$
277.9

December 31, 2018
 

 
 

 
 

 
 

Assets
 
 
 
 
 
 
 

Cash equivalents
$

 
$
11.8

 
$

 
$
11.8

Available-for-sale investments:
 
 
 
 
 
 
 
Corporate debt securities

 
455.6

 

 
455.6

Asset-backed securities

 
110.2

 

 
110.2

U.S. government and agency securities
19.6

 
59.6

 

 
79.2

Foreign government bonds

 
1.7

 

 
1.7

Commercial paper

 
56.7

 

 
56.7

Municipal securities

 
2.8

 

 
2.8

Investments held for deferred compensation plans
67.6

 

 

 
67.6

Derivatives

 
29.9

 

 
29.9

 
$
87.2

 
$
728.3

 
$

 
$
815.5

Liabilities
 

 
 

 
 

 
 

Derivatives
$

 
$
5.2

 
$

 
$
5.2

Deferred compensation plans
68.5

 

 

 
68.5

Contingent consideration liabilities


 

 
178.6

 
178.6

 
$
68.5

 
$
5.2

 
$
178.6

 
$
252.3


Summary of Changes in Fair Value of Contingent Consideration Obligation
The following table summarizes the changes in fair value of the contingent consideration liabilities for the six months ended June 30, 2019 (in millions):

Balance at December 31, 2018
 
$
178.6

Changes in fair value
 
14.7

Balance at June 30, 2019
 
$
193.3