STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2019

Stock-Based Compensation [Abstract]

Stock-Based Compensation Cost and Associated Tax Benefit

	Three Months Ended March 31,
	2019		2018
Stock-based compensation expense	$	35.7	$	35.1
Tax benefit	$	7.8	$	7.2

Weighted Average Assumptions used in Determining Fair Value for Options Granted

Expected dividend yield	1.15%
Expected stock volatility	23.62%
Risk-free interest rate	2.60%
Expected holding period	6.2 years
Grant date fair value	$43.10

Stock Option Exercises and Restricted Stock Vesting

		Three Months Ended March 31,
		2019		2018
Exercise of stock options:
	Proceeds from stock option exercises	$	11.9	$	26.6
	Aggregate intrinsic value	$	35.6	$	61.9
	Tax benefit realized upon exercise	$	8.5	$	15.0
	Number of shares exercised		0.3		0.5
Vesting of restricted stock:
	Fair value of shares vested	$	146.5	$	146.7
	Tax benefit realized upon vesting	$	33.6	$	33.9
	Number of shares vested		0.8		0.9
Vesting of performance-based restricted stock:
	Fair value of shares vested	$	47.5	$	23.0
	Tax benefit realized upon vesting	$	11.5	$	5.5
	Number of shares vested		0.3		0.1