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STOCK-BASED COMPENSATION. (Restricted Shares and Stock Units) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
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 at December 31, 2018 (in dollars per share) $ 87.07    
Weighted-average fair value of restricted shares and restricted stock units vested (in dollars per share) 84.18    
Weighted-average fair value of restricted shares and restricted stock units forfeited (in dollars per share) 87.84    
Weighted-average fair value of nonvested restricted shares and restricted stock units at December 31, 2019 (in dollars per share) $ 98.75 $ 87.07  
Value at vest date $ 227.1    
Vested stock units (in shares) 57,243    
Time-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) $ 120.22    
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) $ 120.79    
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 $ 201.5 $ 181.8 $ 124.0
Restricted shares      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Nonvested at December 31, 2018 (in shares) 136,964    
Vested (in shares) (126,885)    
Forfeited (in shares) (10,079)    
Nonvested at December 31, 2019 (in shares) 7,404 136,964  
Restricted shares | Time-based      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Grants (in shares) 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 at December 31, 2018 (in shares) 6,603,920    
Vested (in shares) (1,741,795)    
Forfeited (in shares) (350,196)    
Nonvested at December 31, 2019 (in shares) 6,718,261 6,603,920  
Restricted stock units | Time-based      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Grants (in shares) 2,120,284    
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) 84,240    
Nonvested at December 31, 2019 (in shares) 458,061    
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) 213,000    
Non-employee directors      
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) $ 111.26    
Non-employee directors | Restricted shares      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Grants (in shares) 0    
Non-employee directors | Restricted stock units      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]      
Grants (in shares) 1,808