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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