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FAIR VALUE MEASUREMENTS - Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Assets
Available-for-sale investments:	$ 1,184.4	$ 1,481.0
Corporate debt securities
Assets
Available-for-sale investments:	830.9	980.3
Asset-backed securities
Assets
Available-for-sale investments:	252.5	366.6
United States government and agency securities
Assets
Available-for-sale investments:	98.4	131.6
Municipal securities
Assets
Available-for-sale investments:	2.6	2.5
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis
Assets
Cash equivalents	635.0	280.4
Investments held for deferred compensation plans	125.3	112.1
Derivatives	63.9	65.5
Assets	2,008.6	1,939.0
Liabilities
Derivatives	17.8	27.2
Contingent consideration liabilities		26.2
Other liability	14.0	14.0
Liabilities	31.8	67.4
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Corporate debt securities
Assets
Available-for-sale investments:	830.9	980.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Asset-backed securities
Assets
Available-for-sale investments:	252.5	366.6
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | United States government and agency securities
Assets
Available-for-sale investments:	98.4	131.6
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Municipal securities
Assets
Available-for-sale investments:	2.6	2.5
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1
Assets
Cash equivalents	635.0	280.4
Investments held for deferred compensation plans	125.3	112.1
Derivatives	0.0	0.0
Assets	760.3	429.6
Liabilities
Derivatives	0.0	0.0
Contingent consideration liabilities		0.0
Other liability	0.0	0.0
Liabilities	0.0	0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 | Corporate debt securities
Assets
Available-for-sale investments:	0.0	0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 | Asset-backed securities
Assets
Available-for-sale investments:	0.0	0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 | United States government and agency securities
Assets
Available-for-sale investments:	0.0	37.1
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 1 | Municipal securities
Assets
Available-for-sale investments:	0.0	0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2
Assets
Cash equivalents	0.0	0.0
Investments held for deferred compensation plans	0.0	0.0
Derivatives	63.9	65.5
Assets	1,248.3	1,509.4
Liabilities
Derivatives	17.8	27.2
Contingent consideration liabilities		0.0
Other liability	0.0	0.0
Liabilities	17.8	27.2
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Corporate debt securities
Assets
Available-for-sale investments:	830.9	980.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Asset-backed securities
Assets
Available-for-sale investments:	252.5	366.6
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | United States government and agency securities
Assets
Available-for-sale investments:	98.4	94.5
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Municipal securities
Assets
Available-for-sale investments:	2.6	2.5
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3
Assets
Cash equivalents	0.0	0.0
Investments held for deferred compensation plans	0.0	0.0
Derivatives	0.0	0.0
Assets	0.0	0.0
Liabilities
Derivatives	0.0	0.0
Contingent consideration liabilities		26.2
Other liability	14.0	14.0
Liabilities	14.0	40.2
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 | Corporate debt securities
Assets
Available-for-sale investments:	0.0	0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 | Asset-backed securities
Assets
Available-for-sale investments:	0.0	0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 | United States government and agency securities
Assets
Available-for-sale investments:	0.0	0.0
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 3 | Municipal securities
Assets
Available-for-sale investments:	$ 0.0	$ 0.0

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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