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INCOME TAXES. (Provision for Income Taxes) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]      
U.S. federal $ 484.2 $ 708.1 $ 573.7
State and local 138.7 131.0 105.8
Foreign 28.5 13.1 13.5
Deferred income taxes (benefits) (35.5) 71.7 13.5
Total $ 615.9 $ 923.9 $ 706.5