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STOCK COMPENSATION PLANS (Tables)
 12 Months Ended
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Disclosure of Share Based Compensation Arrangements by Share Based Payment Awards
Changes in options outstanding under the plans for the period indicated were as follows:
Number of
Options		Weighted-Average
Exercise Price
per Option		Weighted-Average
Remaining
Contractual Term		Aggregate
Intrinsic
Value
Outstanding at December 31, 20190.6 125.26   
Granted0.1 182.71   
Exercised(0.2)93.55   
Canceled— —   
Outstanding at December 31, 20200.5 148.39 6.5$27.5 
Exercisable at December 31, 20200.3 126.55 4.9$20.5 
Disclosure of the Impact of Stock Options Exercised
Cash received by the Company from option exercises, the actual tax benefit realized for the tax deductions and the aggregate intrinsic value of options exercised from option exercises under all share-based payment arrangements during the years ended December 31, 2020, 2019, and 2018 were as follows:
 202020192018
Cash received by the Company$17.5 $27.6 $37.5 
Tax benefits realized$4.6 $6.9 $9.4 
Aggregate intrinsic value$18.5 $24.5 $44.1 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The following table shows the weighted average grant-date fair values of options issued during the respective year and the weighted average assumptions that the Company used to develop the fair value estimates:
 20202019
Fair value per option$40.06 $33.70 
Weighted average expected life (in years)6.06.0
Risk free interest rate1.5 %2.1 %
Expected volatility20.3 %20.4 %
Expected dividend yieldN/AN/A
The Company uses the Black-Scholes model to calculate the fair value of the employee’s purchase right. The fair value of the employee’s purchase right and the assumptions used in its calculation are as follows:
 202020192018
Fair value of the employee’s purchase right$35.49 $31.84 $34.43 
Valuation assumptions   
Risk free interest rate0.1 %1.9 %2.3 %
Expected volatility0.30.20.2
Expected dividend yield— — — 
Schedule of Nonvested Share Activity
The following table shows a summary of non-vested shares for the year ended December 31, 2020:
Number of
Shares		Weighted-Average
Grant Date Fair Value
Non-vested at January 1, 20201.3 $152.70 
Granted0.7 182.88 
Vested(0.6)144.55 
Canceled(0.1)167.56 
Non-vested at December 31, 20191.3 $170.04