STOCK-BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2017

Stock-Based Compensation Cost and Associated Tax Benefit

	Three Months Ended				Nine months ended
	September 30,				September 30,
	2017		2016		2017		2016
Stock-based compensation cost	$	31.8	$	23.9	$	88.9	$	72.8
Tax benefit	$	10.3	$	7.8	$	28.8	$	23.7

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 years
Grant date fair value	$30.00

Stock Option Exercises and Restricted Stock Vesting

	Nine months ended
	September 30,
Exercise of stock options:	2017		2016
Proceeds from stock option exercises	$	44.0	$	67.7
Aggregate intrinsic value	$	75.7	$	67.8
Tax benefit realized upon exercise	$	26.9	$	23.1
Number of shares exercised		1.0		1.4
	Nine months ended
	September 30,
Vesting of restricted stock:	2017		2016
Fair value of shares vested	$	109.1	$	92.8
Tax benefit realized upon vesting	$	34.6	$	29.5
Number of shares vested		1.0		1.0
	Nine months ended
	September 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