STOCK BASED COMPENSATION (Tables)

9 Months Ended

Sep. 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 September 30,				Nine Months Ended September 30,
	2019		2018		2019		2018
Stock option plan	$	0.9	$	2.5	$	6.8	$	8.4
RSUs		2.0		2.0		6.0		5.8
PSUs		0.5		1.9		0.2		4.5
ESPP		0.3		0.3		0.7		0.8
Total expense	$	3.7	$	6.7	$	13.7	$	19.5

Stock Option Activity

Stock option activity for the nine months ended September 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		340,652			49.01
Exercised		(267,566	)		51.50
Forfeited		(387,082	)		89.17
Canceled or expired		(373,137	)		97.89
Outstanding as of September 30, 2019		4,209,253		$	95.37		3.2	$	0.8
Exercisable as of September 30, 2019		3,351,023		$	100.83		2.5	$	-

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 September 30,						Nine Months Ended September 30,
	2019			2018			2019			2018
Stock options granted (shares)		30,666			1,712			340,652			362,382
Weighted average fair value at grant date	$	13.74		$	18.09		$	14.41		$	16.87
Assumptions:
Expected term (in years)		4.34			4.89			4.40			4.89
Expected volatility		32.63	%		25.68	%		30.99	%		25.34	%
Expected dividend yield		0.00	%		0.00	%		0.00	%		0.00	%
Risk free interest rate		1.76	%		2.74	%		2.35	%		2.58	%

Summary of RSU Activity

RSU activity for the nine months ended September 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		262,864			48.57
Vested and released		(105,677	)		73.47
Forfeited		(115,001	)		69.30
Non-vested as of September 30, 2019		471,996		$	59.12		1.6	$	24.0

Summary of PSU Activity

PSU activity for the nine months ended September 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		157,451			48.59
Vested and released		(65,095	)		63.38
Forfeited		(84,936	)		58.11
Non-vested as of September 30, 2019		122,928		$	48.45