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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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) | 1.30% | 0.60% | 0.40%
Foreign operations (as a percent) | (0.80%) | (0.60%) | (1.30%)
Excess stock benefits (as a percent) | (0.40%) | (2.00%) | (4.90%)
R&D credit (as a percent) | (1.40%) | (1.30%) | (1.10%)
Foreign derived intangible income | (1.80%) | (1.60%) | (0.20%)
Change in valuation allowance (as a percent) | 0.70% | 0.50% | 0.60%
Legal entity rationalization (as a percent) | (1.50%) |  |
One-time transfer of intangibles (as a percent) |  | 1.80% |
Other, net (as a percent) | 0.40% | 0.70% | 0.70%
Effective income tax rate (as a percent) | 17.50% | 19.10% | 15.20%
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, | (53.7) | 53.3 | $ 57.9
Recognized discrete tax expense (benefit), net |  | 5.8 | 55.8
Recognized discrete tax benefits, legal entity rationalization | 14.6 |  |
Excess tax benefits, share-based compensation | 6.0 | 29.1 | 57.3
Recognized discrete tax benefits | 11.8 |  |
Tax expense (benefit) due to audit settlements and statutes of limitations |  |  | 9.8
Amount of adjustments recognized from filing prior year U.S. federal and state tax returns, used to derive net discrete tax benefit |  |  | 11.3
Reconciliation of the beginning and ending amount of gross unrecognized tax benefits |  |  |
Balance at beginning of year | 25.1 | 20.7 | 27.0
Additions based on tax positions related to the current year | 2.7 | 3.8 | 3.3
Additions for tax positions of prior years | 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) |  | (1.1)
Reductions for tax positions due to statute of limitations | (0.7) | (3.0) | (9.1)
Settlements | (3.4) | (3.7) |
Foreign currency translation | (0.9) | (0.1) | 0.6
Balance at end of year | 24.9 | 25.1 | 20.7
Unrecognized tax benefits that would affect the annual effective tax rate | 23.1 | 22.8 | 18.3
Accrued interest, including minor amounts for penalties | $ 4.0 | 3.2 | $ 4.1
Purolite |  |  |
Reconciliation of the statutory U.S. federal income tax rate to the company's effective income tax rate |  |  |
Deferred tax liability |  | $ 12.1 |

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