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INCOME TAXES. (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Reform [Line Items]      
Income tax provision related to the tax law changes     $ 20.8
Previously taxed earnings and profits of foreign subsidiaries with unremitted earnings $ 791.0    
Tax refund receivables 25.0 $ 31.8  
Net income taxes paid 643.0 677.3 644.2
Net tax benefits reducing income tax provision 61.9 42.7 40.6
Net interest payable related to unrecognized tax benefits 1.9 $ 2.1  
State and local jurisdiction      
Income Tax Reform [Line Items]      
Deferred tax liabilities for intended repatriation $ 1.0    
State and local jurisdiction | Comptroller of Maryland      
Income Tax Reform [Line Items]      
Nonrecurring income tax charge due to Maryland state tax legislation     $ 7.9