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STOCK COMPENSATION PLANS (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangements by Share-based Payment Award      
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term 6 years 6 years  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value $ 40.06 $ 33.70  
Number of shares purchased by eligible employees 0.3    
Fair value of the employee's purchase right $ 35.49 $ 31.84 $ 34.43
Risk free interest rate 1.50% 2.10%  
Expected volatility 20.30% 20.40%  
Shares of common stock authorized for issuance under the employee stock purchase plan 1.8    
The employee stock purchase plan permits employees to purchase shares of common stock at a certain percentage of the market price (in hundredths) 85.00%    
Expense related to the Company's employee stock purchase plan $ 10.3 $ 9.9 $ 8.0
Unrecognized compensation cost related to nonvested restricted stock and performance share-based compensation arrangements $ 115.5    
Performance share awards, vesting conditions Performance share awards are subject to certain earnings per share, revenue, and total shareholder return targets    
Restricted stock, vesting increment one-third increments beginning on the first anniversary of the grant    
Cash received by the Company $ 17.5 27.6 37.5
Share-based Payment Arrangement, Exercise of Option, Tax Benefit 4.6 6.9 9.4
Aggregate intrinsic value $ 18.5 24.5 44.1
Unrecognized compensation cost weighted average expected future recognition period (in years) 1 year 9 months 18 days    
Restricted stock and performance share compensation expense $ 98.1 $ 91.2 $ 80.1
Employee Stock Purchase Plan [Member]      
Share-based Compensation Arrangements by Share-based Payment Award      
Risk free interest rate 0.10% 1.90% 2.30%
Expected volatility 30.00% 20.00% 20.00%
Expected dividend yield 0.00% 0.00% 0.00%
Restricted Stock and Performance Shares [Member]      
Share-based Compensation Arrangements by Share-based Payment Award      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value $ 167.56    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number 1.3 1.3  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value $ 170.04 $ 152.70  
Number of options granted 0.7    
Weighted-average grant date fair value, granted $ 182.88    
Number of options vested (0.6)    
Weighted-average grant date fair value, vested $ 144.55    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period (0.1)    
Stock Options [Member]      
Share-based Compensation Arrangements by Share-based Payment Award      
Aggregate intrinsic value, exercisable options $ 20.5    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number 0.5 0.6  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price $ 148.39 $ 125.26  
Number of options granted 0.1    
Weighted-average exercise price per option granted $ 182.71    
Number of options exercised (0.2)    
Weighted-average exercise price per option exercised $ 93.55    
Number of options cancelled 0.0    
Weighted-average exercise price per option cancelled $ 0    
Weighted-average remaining contractual term of options outstanding (in years) 6 years 6 months    
Aggregate intrinsic value of options outstanding $ 27.5    
Number of options exercisable 0.3    
Weighted-average exercise price per exercisable option $ 126.55    
Weighted-average remaining contractual term, exercisable options (in years) 4 years 10 months 24 days