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INCOME TAXES - Reconciliation of the Statutory Rate to Effective Rate (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reconciliation of the statutory U.S. federal income tax rate to the company's effective income tax rate |  |  |
Statutory U.S. rate (as a percent) | 21.00% | 21.00% | 21.00%
State income taxes, net of federal benefit (as a percent) | 1.40% | 1.30% | 0.60%
Foreign operations (as a percent) | (0.50%) | (0.80%) | (0.60%)
Excess stock benefits (as a percent) | (0.30%) | (0.40%) | (2.00%)
R&D credit (as a percent) | (1.30%) | (1.40%) | (1.30%)
Foreign derived intangible income (as a percent) | (1.20%) | (1.80%) | (1.60%)
Change in valuation allowance (as a percent) | 0.50% | 0.70% | 0.50%
Legal entity rationalization (as a percent) | 0.10% | (1.50%) |
One-time transfer of intangibles (as a percent) |  |  | 1.80%
Other, net (as a percent) | 0.90% | 0.40% | 0.70%
Effective income tax rate (as a percent) | 20.60% | 17.50% | 19.10%
Discrete tax charges |  |  | $ 34.9
Non-cash deferred tax charge |  |  | 25.1
Remaining tax expense |  | $ 8.8 | 9.8
Special gains and charges, recognized discrete tax expense (benefit), net, | $ (24.7) | 53.7 | 53.3
Recognized discrete tax expense (benefit), net |  |  | 5.8
Recognized discrete tax benefits, legal entity rationalization |  | 14.6 |
Excess tax benefits, share-based compensation |  | 6.0 | 29.1
Recognized discrete tax benefits | 11.2 | 11.8 |
Reconciliation of the beginning and ending amount of gross unrecognized tax benefits |  |  |
Balance at beginning of year | 24.9 | 25.1 | 20.7
Additions based on tax positions related to the current year | 5.8 | 2.7 | 3.8
Additions for tax positions of prior years | 1.7 | 3.6 | 3.0
Current year acquisitions |  |  | 4.4
Assumed in connection with acquisitions |  |  | 4.4
Reductions for tax positions of prior years |  | (1.5) |
Reductions for tax positions due to statute of limitations | (2.7) | (0.7) | (3.0)
Settlements | (5.5) | (3.4) | (3.7)
Foreign currency translation |  | (0.9) | (0.1)
Balance at end of year | 24.2 | 24.9 | 25.1
Unrecognized tax benefits that would affect the annual effective tax rate | 21.6 | 23.1 | 22.8
Accrued interest, including minor amounts for penalties | 4.0 | $ 4.0 | $ 3.2
Purolite |  |  |
Reconciliation of the statutory U.S. federal income tax rate to the company's effective income tax rate |  |  |
Deferred tax liability | $ 2.8 |  |

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