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INCOME TAXES - Reconciliation of the Statutory Rate to Effective Rate (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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% | 35.00%
State income taxes, net of federal benefit (as a percent) |  | 0.40% | 1.80% | 1.20% |
Foreign operations (as a percent) |  | (1.30%) | 5.50% | (15.50%) |
R&D credit (as a percent) |  | (1.10%) | (1.00%) | (1.00%) |
Change in valuation allowance (as a percent) |  | 0.60% | (8.20%) | 10.30% |
Excess stock benefits (as a percent) |  | (4.90%) | (2.40%) | (1.70%) |
One time transition tax (as a percent) |  |  | (0.2) | 4.2 |
Prior year adjustments (as a percent) |  |  |  | 2.90% |
Other, net (as a percent) |  | 0.50% | 0.20% | (1.20%) |
Effective income tax rate (as a percent) |  | 15.20% | 16.70% | 20.20% |
Net tax benefit for the one-time transition |  |  | $ 3.1 |  |
Net expense for the one-time transition |  |  |  | $ 66.0 |
Special gains and charges, recognized discrete tax expense (benefit), net, |  | $ 57.9 | 40.1 | (29.0) |
Recognized discrete tax expense (benefit), net |  | 55.8 | 54.6 | 64.0 |
Excess tax benefits, share-based compensation |  | 57.3 | 42.3 | 27.7 |
Effective Income Tax |  |  | 15.6 |  |
Net discrete expense (benefit), prior year returns |  |  | 11.0 | (39.5) |
Out of period charges incurred | $ 38.0 |  |  |  |
Tax expense (benefit) due to issuance of final regulations governing taxation of foreign dividends |  |  | 10.2 |  |
Tax expense (benefit) due to passage of tax reform. |  |  | 30.4 |  |
Tax expense (benefit) due to audit settlements and statutes of limitations |  | 9.8 | 13.8 |  |
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 |  | 27.0 | 49.0 | 60.6 |
Additions based on tax positions related to the current year |  | 3.3 | 2.1 | 3.0 |
Additions for tax positions of prior years |  |  | 1.0 | 2.0 |
Reductions for tax positions of prior years |  | (1.1) | (18.4) | (8.7) |
Reductions for tax positions due to statute of limitations |  | (9.1) | (5.7) | (5.8) |
Settlements |  |  | (0.6) | (0.8) |
Foreign currency translation |  | 0.6 | (0.4) | (1.3) |
Balance at end of year | 49.0 | 20.7 | 27.0 | 49.0 | $ 60.6
Unrecognized tax benefits that would affect the annual effective tax rate | 35.6 | 18.3 | 23.7 | 35.6 |
Interest and penalties on unrecognized tax benefits accrued during the period |  | (2.0) | 1.9 | 1.2 |
Accrued interest, including minor amounts for penalties | $ 8.0 | $ 4.1 | $ 6.1 | $ 8.0 |

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