FAIR VALUE MEASUREMENTS - Schedule of Financial Instruments Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Assets
Available-for-sale investments:	$ 749.8	$ 898.7
Corporate debt securities
Assets
Available-for-sale investments:	541.5	641.8
Asset-backed securities
Assets
Available-for-sale investments:	144.2	184.3
United States government and agency securities
Assets
Available-for-sale investments:	61.4	70.0
Municipal securities
Assets
Available-for-sale investments:	2.7	2.6
Estimate of Fair Value Measurement \| Fair Value on a Recurring Basis
Assets
Cash equivalents	430.0	579.2
Investments held for deferred compensation plans	130.7	125.8
Derivatives	57.5	47.1
Assets	1,368.0	1,650.8
Liabilities
Derivatives	4.9	15.2
Other	5.0	10.3
Liabilities	9.9	25.5
Estimate of Fair Value Measurement \| Fair Value on a Recurring Basis \| Corporate debt securities
Assets
Available-for-sale investments:	541.5	641.8
Estimate of Fair Value Measurement \| Fair Value on a Recurring Basis \| Asset-backed securities
Assets
Available-for-sale investments:	144.2	184.3
Estimate of Fair Value Measurement \| Fair Value on a Recurring Basis \| United States government and agency securities
Assets
Available-for-sale investments:	61.4	70.0
Estimate of Fair Value Measurement \| Fair Value on a Recurring Basis \| Municipal securities
Assets
Available-for-sale investments:	2.7	2.6
Estimate of Fair Value Measurement \| Fair Value on a Recurring Basis \| Level 1
Assets
Cash equivalents	430.0	579.2
Investments held for deferred compensation plans	130.7	125.8
Derivatives	0.0	0.0
Assets	560.7	705.0
Liabilities
Derivatives	0.0	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	0.0
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	57.5	47.1
Assets	807.3	945.8
Liabilities
Derivatives	4.9	15.2
Other	0.0	0.0
Liabilities	4.9	15.2
Estimate of Fair Value Measurement \| Fair Value on a Recurring Basis \| Level 2 \| Corporate debt securities
Assets
Available-for-sale investments:	541.5	641.8
Estimate of Fair Value Measurement \| Fair Value on a Recurring Basis \| Level 2 \| Asset-backed securities
Assets
Available-for-sale investments:	144.2	184.3
Estimate of Fair Value Measurement \| Fair Value on a Recurring Basis \| Level 2 \| United States government and agency securities
Assets
Available-for-sale investments:	61.4	70.0
Estimate of Fair Value Measurement \| Fair Value on a Recurring Basis \| Level 2 \| Municipal securities
Assets
Available-for-sale investments:	2.7	2.6
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
Other	5.0	10.3
Liabilities	5.0	10.3
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

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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