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INCOME TAXES. (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]        
Unremitted earnings of foreign subsidiaries $ 604.0 $ 604.0    
Tax refund receivables 43.2 43.2 $ 8.1  
Net income taxes paid   857.7 680.6 $ 778.6
Additional income tax benefit arising from stock-based compensation       $ 23.2
Net tax benefits reducing income tax provision   75.5 31.6  
Net interest payable related to unrecognized tax benefits 1.5 1.5 $ 1.2  
Income tax provision related to the tax law changes $ 71.1 71.1    
Income tax provision related to remeasurement of deferred tax assets and liabilities   18.9    
Income tax provision related to mandatory deemed repatriation of foreign sourced net earnings   $ 52.2