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INCOME TAXES (Effective Income Tax Rate Reconciliation) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Provision at Federal statutory rate 21.00% 21.00% 21.00%
State income taxes (net of federal income tax) 5.60% 3.90% 5.00%
Nondeductible/nontaxable items (0.10%) 0.10% 1.00%
Rate differential from foreign jurisdictions 0.00% (0.20%) 0.90%
Provision to return adjustment (0.10%) (0.10%) (4.00%)
Adjustment to deferred tax assets and liabilities for change in tax rates 0.10% (0.50%) 0.00%
Stock-based compensation 0.00% 0.10% (2.60%)
Deferred tax asset valuation allowance (25.80%) 0.00% 0.00%
Other (0.90%) 0.30% (0.60%)
Effective tax rate (0.20%) 24.60% 20.70%
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent (0.20%) 21.80% 16.00%
Less: net income attributable to noncontrolling interests $ 59.1 $ 55.8 $ 47.0