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INCOME TAXES - Reconciliation of Federal Statutory Income Tax Rate to Effective Income Tax Rate (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Income tax expense at U.S. federal statutory rate $ 192.5 $ 245.0 $ 159.9
Foreign income taxed at different rates (80.5) (75.0) (16.2)
State and local taxes, net of federal tax benefit 5.0 11.9 6.8
Tax credits, federal and state (43.1) (42.9) (36.7)
Build (release) of reserve for prior years' uncertain tax positions 4.2 5.0 (35.5)
U.S. tax on foreign earnings, net of credits 1.5 (2.9) (12.2)
Tax on global intangible low-taxed income 49.2 32.0 0.0
Foreign-derived intangible income deduction (2.6) (7.2) (6.6)
U.S. federal deductible employee share-based compensation (48.3) (57.6) (41.8)
Nondeductible employee share-based compensation 4.2 3.2 2.8
Impact related to 2017 U.S. Tax Reform 0.0 2.8 15.8
Other 11.2 5.3 2.9
Total income tax provision $ 93.3 $ 119.6 $ 39.2