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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

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