FAIR VALUE MEASUREMENTS (Tables)

9 Months Ended

Sep. 30, 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 (in millions):

September 30, 2020	Level 1		Level 2		Level 3		Total
Assets
Cash equivalents	$	2.3	$	11.1	$	—	$	13.4
Available-for-sale investments:
Bank time deposits	—		33.3		—		33.3
Corporate debt securities	—		471.9		—		471.9
Asset-backed securities	—		137.2		—		137.2
U.S. government and agency securities	57.7		75.1		—		132.8
Foreign government bonds	—		1.7		—		1.7
Commercial paper	—		60.1		—		60.1
Investments held for deferred compensation plans	97.8		—		—		97.8
Derivatives	—		27.5		—		27.5
	$	157.8	$	817.9	$	—	$	975.7
Liabilities
Derivatives	$	—	$	21.4	$	—	$	21.4
Deferred compensation plans	97.8		—		—		97.8
Contingent consideration liabilities	—		—		180.9		180.9
	$	97.8	$	21.4	$	180.9	$	300.1
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 securities	76.1		37.7		—		113.8
Foreign government bonds	—		1.7		—		1.7
Commercial paper	—		34.3		—		34.3
Investments held for deferred compensation plans	88.9		—		—		88.9
Derivatives	—		30.7		—		30.7
	$	165.7	$	780.1	$	—	$	945.8
Liabilities
Derivatives	$	—	$	6.4	$	—	$	6.4
Deferred compensation plans	88.7		—		—		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 liabilities (in millions):

	Nine Months Ended    September 30,
	2020		2019
Balance at December 31	$	172.5	$	178.6
Changes in fair value	8.4		12.4
Balance at September 30	$	180.9	$	191.0