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STOCK-BASED COMPENSATION. (Restricted Shares and Stock Units) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted-average fair value of nonvested restricted shares and restricted stock units, beginning balance (in dollars per share) $ 98.75    
Weighted-average fair value of restricted shares and restricted stock units granted (in dollars per share) 151.90    
Weighted-average fair value of restricted shares and restricted stock units vested (in dollars per share) 92.14    
Weighted-average fair value of restricted shares and restricted stock units nonvested dividend equivalents granted to non-employee directors (in dollars per share) 123.48    
Weighted-average fair value of restricted shares and restricted stock units forfeited (in dollars per share) 99.76    
Weighted-average fair value of nonvested restricted shares and restricted stock units, ending balance (in dollars per share) $ 116.51 $ 98.75  
Value at vest date $ 310.5    
Vested stock units (in shares) 76,352    
Performance-based      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Weighted-average fair value of restricted shares and restricted stock units granted (in dollars per share) $ 153.17    
Restricted shares and restricted stock units | Compensation and related costs      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Stock-based compensation expense $ 244.1 $ 201.5 $ 181.8
Restricted shares      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Nonvested, beginning balance (in shares) 7,404    
Grants (in shares) 7,412    
Vested (in shares) (7,404)    
Nonvested dividend equivalents granted to non-employee directors (in shares) 0    
Forfeited (in shares) 0    
Nonvested, ending balance (in shares) 7,412 7,404  
Restricted shares | Performance-based      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Grants (in shares) 0    
Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Nonvested, beginning balance (in shares) 6,718,261    
Grants (in shares) 1,780,119    
Vested (in shares) (2,096,963)    
Nonvested dividend equivalents granted to non-employee directors (in shares) 2,356    
Forfeited (in shares) (115,878)    
Nonvested, ending balance (in shares) 6,367,059 6,718,261  
Restricted stock units | Performance-based      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Grants (in shares) 79,164    
Nonvested, ending balance (in shares) 416,664    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Nonvested shares where performance threshold has been met (in shares) 253,260