STOCK BASED COMPENSATION (Tables)

6 Months Ended

Jun. 30, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-Based Compensation Expense Resulting from Stock Option Awards, RSUs, PSUs, and ESPP

The following table presents the total stock-based compensation expense resulting from stock option awards, RSUs, PSUs, and the ESPP included in SG&A in the Condensed Consolidated Statements of (Loss) Income:

In millions
	Three Months Ended June 30,					Six Months Ended June 30,
	2019			2018		2019			2018
Stock option plan	$	3.9		$	2.9	$	5.9		$	5.9
RSUs		2.2			1.7		4.0			3.8
PSUs		(0.5	)		1.0		(0.3	)		2.6
ESPP		0.1			0.1		0.4			0.5
Total expense	$	5.7		$	5.7	$	10.0		$	12.8

Stock Option Activity

Stock option activity for the six months ended June 30, 2019 is summarized as follows:

	Number of Options			Weighted Average Exercise Price per Share		Weighted Average Remaining Contractual Life		Total Aggregate Intrinsic Value
						(in years)		(in millions)
Outstanding at January 1, 2019		4,896,386		$	95.85
Granted		309,986			49.25
Exercised		(267,566	)		51.50
Forfeited		(218,390	)		91.01
Canceled or expired		(143,390	)		87.07
Outstanding as of June 30, 2019		4,577,026		$	95.75		3.8	$	0.1
Exercisable as of June 30, 2019		3,534,197		$	101.06		3.1	$	-

Assumptions Used in Black-Scholes Option Pricing Model

The estimated fair value of stock options at the time of the grant using the Black-Scholes option pricing model was as follows:

	Three Months Ended June 30,						Six Months Ended June 30,
	2019			2018			2019			2018
Stock options granted (shares)		32,852			21,836			309,986			360,670
Weighted average fair value at grant date	$	16.85		$	16.79		$	14.48		$	16.87
Assumptions:
Expected term (in years)		4.34			4.89			4.40			4.89
Expected volatility		31.77	%		25.54	%		30.82	%		25.34	%
Expected dividend yield		0.00	%		0.00	%		0.00	%		0.00	%
Risk free interest rate		2.29	%		2.70	%		2.41	%		2.58	%

Summary of RSU Activity

RSU activity for the six months ended June 30, 2019 is summarized as follows:

	Number of Units			Weighted Average Grant Date Fair Value		Weighted Average Remaining Contractual Life		Total Aggregate Intrinsic Value
						(in years)		(in millions)
Non-vested at January 1, 2019		429,810		$	72.02
Granted		247,966			48.78
Vested and released		(99,064	)		74.07
Forfeited		(63,631	)		71.50
Non-vested as of June 30, 2019		515,081		$	60.49		1.8	$	24.6

Summary of PSU Activity

PSU activity for the six months ended June 30, 2019, is summarized as follows:

	Number of Units			Weighted Average Grant Date Fair Value
Non-vested at January 1, 2019		115,508		$	63.77
Granted		150,559			48.74
Vested and released		(64,751	)		63.32
Forfeited		(66,207	)		60.43
Non-vested as of June 30, 2019		135,109		$	48.88