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FAIR VALUE MEASUREMENTS - Schedule of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Assets
Available-for-sale investments:	$ 898.7	$ 1,481.0
Corporate debt securities
Assets
Available-for-sale investments:	641.8	980.3
Asset-backed securities
Assets
Available-for-sale investments:	184.3	366.6
United States government and agency securities
Assets
Available-for-sale investments:	70.0	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	579.2	280.4
Investments held for deferred compensation plans	125.8	112.1
Derivatives	47.1	65.5
Total assets	1,650.8	1,939.0
Liabilities
Derivatives	15.2	27.2
Contingent consideration liabilities		26.2
Other	10.3	14.0
Total liabilities	25.5	67.4
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Corporate debt securities
Assets
Available-for-sale investments:	641.8	980.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Asset-backed securities
Assets
Available-for-sale investments:	184.3	366.6
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | United States government and agency securities
Assets
Available-for-sale investments:	70.0	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	579.2	280.4
Investments held for deferred compensation plans	125.8	112.1
Derivatives	0.0	0.0
Total assets	705.0	429.6
Liabilities
Derivatives	0.0	0.0
Contingent consideration liabilities		0.0
Other	0.0	0.0
Total 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	47.1	65.5
Total assets	945.8	1,509.4
Liabilities
Derivatives	15.2	27.2
Contingent consideration liabilities		0.0
Other	0.0	0.0
Total liabilities	15.2	27.2
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Corporate debt securities
Assets
Available-for-sale investments:	641.8	980.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Asset-backed securities
Assets
Available-for-sale investments:	184.3	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:	70.0	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
Total assets	0.0	0.0
Liabilities
Derivatives	0.0	0.0
Contingent consideration liabilities		26.2
Other	10.3	14.0
Total liabilities	10.3	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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