STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2018

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Stock-Based Compensation Cost and Associated Tax Benefit

	Three Months Ended
	March 31,
	2018		2017
Stock-based compensation expense	$	35.1	$	28.4
Tax benefit	$	7.2	$	9.1

Weighted Average Assumptions used in Determining Fair Value for Options Granted

Expected dividend yield	1.05%
Expected stock volatility	25.6%
Risk-free interest rate	2.81%
Expected holding period	6.2 years
Grant date fair value	$45.87

Stock Option Exercises and Restricted Stock Vesting

	Three Months Ended
	March 31,
Exercise of stock options:	2018		2017
Proceeds from stock option exercises	$	26.6	$	20.6
Aggregate intrinsic value	$	61.9	$	21.6
Tax benefit realized upon exercise	$	15.0	$	7.9
Number of shares exercised		0.5		0.4
	Three Months Ended
	March 31,
Vesting of restricted stock:	2018		2017
Fair value of shares vested	$	146.7	$	106.8
Tax benefit realized upon vesting	$	33.9	$	33.7
Number of shares vested		0.9		0.9
	Three Months Ended
	March 31,
Vesting of performance-based restricted stock:	2018		2017
Fair value of shares vested	$	23.0	$	19.5
Tax benefit realized upon vesting	$	5.5	$	6.9
Number of shares vested		0.1		0.2