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SHARE-BASED AWARDS AND OPTIONS (Tables)

12 Months Ended

Dec. 31, 2019

Share-based Payment Arrangement [Abstract]

Schedule of Compensation Cost , Allocation of Share-based Compensation Costs by Plan

The following table summarizes share-based compensation expense and the related income tax benefit recognized for our share-based awards and stock options:

	Years Ended December 31,
	2019				2018				2017
	(in thousands)
Share-based compensation expense	$	89,634			$	57,826			$	39,095
Income tax benefit	$	20,519			$	13,038			$	13,849

Schedule of Changes in Non-Vested Restricted Stock Awards Activity

The following table summarizes the changes in unvested restricted stock awards and performance units for the years ended December 31, 2019, 2018 and 2017:

		Shares			Weighted-Average Grant-Date Fair Value
		(in thousands)
Unvested at December 31, 2016		1,263			$49.55
Granted		899			79.79
Vested		(858	)		39.26
Forfeited		(78	)		59.56
Unvested at December 31, 2017		1,226			78.29
Granted		650			109.85
Vested		(722	)		60.08
Forfeited		(70	)		91.47
Unvested at December 31, 2018		1,084			108.51
Replacement Awards		894			163.74
Granted		784			142.26
Vested		(781	)		105.04
Forfeited		(137	)		124.30
Unvested at December 31, 2019		1,844			$149.96

Schedule of Share-based Compensation, Stock Options, Activity

The following table summarizes changes in stock option activity for the years ended December 31, 2019, 2018 and 2017: 

	Options			Weighted-Average Exercise Price			Weighted-Average Remaining Contractual Term		Aggregate Intrinsic Value
	(in thousands)						(years)		(in millions)
Outstanding at December 31, 2016	759			$37.51			6.0		$24.5
Granted	124			79.45
Exercised	(160	)		23.50					10.1
Outstanding at December 31, 2017	723			47.79			6.4		37.9
Granted	103			114.70
Forfeited	(22	)		100.38
Exercised	(206	)		42.65					16.5
Outstanding at December 31, 2018	598			59.16			6.2		27.3
Replacement Awards	1,336			68.96
Granted	109			128.22
Forfeited	(23	)		110.13
Exercised	(265	)		33.99					28.8
Outstanding at December 31, 2019	1,755			$74.06			6.5		$190.3
Options vested and exercisable at December 31, 2019	1,167			$58.03			5.6		$145.3

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions

Fair value was estimated on the date of grant using the Black-Scholes valuation model with the following weighted-average assumptions:

	Years Ended December 31,
	2019			2018			2017
Risk-free interest rate	1.72	%		2.60	%		1.99	%
Expected volatility	31	%		29	%		30	%
Dividend yield	0.04	%		0.04	%		0.06	%
Expected term (years)	5			5			5

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Tabular disclosure of cost recognized for award under share-based payment arrangement by plan. Includes, but is not limited to, related tax benefit.

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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