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INCOME TAXES. (Provision for Income Taxes) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]      
U.S. federal $ 708.1 $ 573.7 $ 669.5
State and local 131.0 105.8 134.3
Foreign 13.1 13.5 18.9
Deferred income taxes (tax benefits) 71.7 13.5 (43.3)
Total $ 923.9 $ 706.5 $ 779.4