STOCK-BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2017

Stock-Based Compensation Cost and Associated Tax Benefit

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2017		2016		2017		2016
Stock-based compensation cost	$	28.7	$	23.5	$	57.1	$	48.9
Tax benefit	$	9.4	$	7.5	$	18.5	$	15.9

Weighted Average Assumptions used in Determining Fair Value for Options Granted

Expected dividend yield	1.34%
Expected stock volatility	26.8%
Risk-free interest rate	2.19%
Expected holding period	6.5 yrs
Grant date fair value	$29.88

Stock Option Exercises and Restricted Stock Vesting

	Six Months Ended
	June 30,
Exercise of stock options:	2017		2016
Proceeds from stock option exercises	$	35.3	$	33.4
Aggregate intrinsic value	$	52.2	$	21.0
Tax benefit realized upon exercise	$	18.3	$	7.4
Number of shares exercised		0.8		0.6
	Six Months Ended
	June 30,
Vesting of restricted stock:	2017		2016
Fair value of shares vested	$	107.9	$	90.6
Tax benefit realized upon vesting	$	34.1	$	29.6
Number of shares vested		1.0		1.0
	Six Months Ended
	June 30,
Vesting of performance-based restricted stock:	2017		2016
Fair value of shares vested	$	19.5	$	23.6
Tax benefit realized upon vesting	$	6.9	$	8.4
Number of shares vested		0.2		0.2