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INCOME TAXES. (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]        
Income tax provision related to the tax law changes $ 20.8   $ 20.8  
Provisional income tax related to the tax law changes       $ 71.1
Income Tax Reform [Line Items]        
Previously taxed earnings and profits of foreign subsidiaries with unremitted earnings   $ 723.0    
Tax refund receivables   31.8 21.9  
Net income taxes paid   677.3 644.2 857.7
Net tax benefits reducing income tax provision   42.7 40.6 $ 75.5
Net interest payable related to unrecognized tax benefits   2.1 1.2  
State and local jurisdiction        
Income Tax Reform [Line Items]        
Deferred tax liabilities for intended repatriation   $ 0.7    
State and local jurisdiction | Comptroller of Maryland        
Income Tax Reform [Line Items]        
Nonrecurring income tax charge due to Maryland state tax legislation $ 7.9   $ 7.9