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FAIR VALUE MEASUREMENTS - Schedule of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Assets
Available-for-sale investments:	$ 1,020.6	$ 1,481.0
Corporate debt securities
Assets
Available-for-sale investments:	718.7	980.3
Asset-backed securities
Assets
Available-for-sale investments:	219.7	366.6
United States government and agency securities
Assets
Available-for-sale investments:	79.6	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	820.9	280.4
Investments held for deferred compensation plans	123.0	112.1
Derivatives	89.3	65.5
Assets	2,053.8	1,939.0
Liabilities
Derivatives	6.7	27.2
Contingent consideration liabilities		26.2
Other	10.3	14.0
Liabilities	17.0	67.4
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Corporate debt securities
Assets
Available-for-sale investments:	718.7	980.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Asset-backed securities
Assets
Available-for-sale investments:	219.7	366.6
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | United States government and agency securities
Assets
Available-for-sale investments:	79.6	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	554.5	280.4
Investments held for deferred compensation plans	123.0	112.1
Derivatives	0.0	0.0
Assets	677.5	429.6
Liabilities
Derivatives	0.0	0.0
Contingent consideration liabilities		0.0
Other	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	266.4	0.0
Investments held for deferred compensation plans	0.0	0.0
Derivatives	89.3	65.5
Assets	1,376.3	1,509.4
Liabilities
Derivatives	6.7	27.2
Contingent consideration liabilities		0.0
Other	0.0	0.0
Liabilities	6.7	27.2
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Corporate debt securities
Assets
Available-for-sale investments:	718.7	980.3
Estimate of Fair Value Measurement | Fair Value on a Recurring Basis | Level 2 | Asset-backed securities
Assets
Available-for-sale investments:	219.7	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:	79.6	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	10.3	14.0
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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