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INCOME TAXES (Reconciliation of Provision for Income Taxes) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Effective tax rate reconciliation [Abstract] |  |  |
Expected federal income tax provision at statutory rate | $ 105.3 | $ 102.1 | $ 84.8
State income taxes, net of federal benefit | 27.4 | 21.5 | 21.0
Increase (decrease) in valuation allowance | 1.9 | (0.5) | (5.0)
Research credits | (20.2) | (17.5) | (13.1)
Excess tax benefit | (5.9) | (1.8) | (10.9)
Tax reserves | 4.2 | 1.5 | (12.8)
Nondeductible compensation | 8.8 | 11.4 | 10.4
International restructuring | 0.1 | (3.9) | 34.9
Other adjustments | 5.0 | 4.2 | 2.1
Total provision for income taxes | $ 126.6 | $ 117.0 | $ 111.4

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