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INCOME TAXES. (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]          
Income tax provision related to the tax law changes $ 20.8 $ 71.1 $ 20.8    
Provisional income tax related to the tax law changes       $ 71.1  
Income Tax Reform [Line Items]          
Unremitted earnings of foreign subsidiaries     656.0    
Tax refund receivables   43.2 21.9 43.2  
Net income taxes paid     644.2 857.7 $ 680.6
Net tax benefits reducing income tax provision     40.6 75.5 $ 31.6
Net interest payable related to unrecognized tax benefits   $ 1.5 $ 1.2 $ 1.5  
State and local jurisdiction [Member] | Comptroller of Maryland [Member]          
Income Tax Reform [Line Items]          
Nonrecurring income tax charge due to Maryland state tax legislation $ 7.9