STOCK BASED COMPENSATION (Tables)

9 Months Ended

Sep. 30, 2018

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, restricted stock units (“RSUs”), performance-based restricted stock units (“PSUs”), and the Employee Stock Purchase Plan (“ESPP”) included in the Condensed Consolidated Statements of Income (Loss):

In millions
	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Selling, general and administrative - stock option plan	$	2.5	$	3.7	$	8.4	$	11.6
Selling, general and administrative - RSUs		2.0		1.2		5.8		4.1
Selling, general and administrative - PSUs		1.9		0.2		4.5		0.6
Selling, general and administrative - ESPP		0.3		0.3		0.8		1.0
Total pre-tax expense	$	6.7	$	5.4	$	19.5	$	17.3

Stock Option Activity

Stock option activity for the nine months ended September 30, 2018 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, 2018		5,393,417		$	96.91
Granted		362,382			62.06
Exercised		(311,792	)		49.78
Forfeited		(191,322	)		103.38
Canceled or expired		(255,538	)		105.88
Outstanding as of September 30, 2018		4,997,147		$	96.61		4.23	$	3.0
Exercisable as of September 30, 2018		3,557,911		$	96.39		3.61	$	3.0

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,
	2018			2017			2018			2017
Stock options granted (shares)		1,712			18,015			362,382			454,799
Weighted average fair value at grant date	$	18.09		$	17.83		$	16.87		$	19.48
Assumptions:
Expected term (in years)		4.89			4.83			4.89			4.82
Expected volatility		25.68	%		22.95	%		25.34	%		22.68	%
Expected dividend yield		—	%		—	%		—	%		—	%
Risk free interest rate		2.74	%		1.81	%		2.58	%		1.90	%

Summary of RSU Activity

A summary of the status of our non-vested RSUs and changes during the nine months ended September 30, 2018, are 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, 2018		267,297		$	89.74
Granted		293,698			62.23
Vested and Released		(62,313	)		88.29
Forfeited		(56,151	)		74.89
Non-vested as of June 30, 2018		442,531		$	73.28		2.08	$	26.0

Summary of PSU Activity

A summary of the status of our non-vested PSUs and changes during the nine months ended September 30, 2018, are as follows:

	Number of Units			Weighted Average Grant Date Fair Value
Non-vested at January 1, 2018		11,149		$	82.85
Granted		131,182			63.92
Vested and Released		-			-
Forfeited		(24,579	)		72.23
Non-vested as of September 30, 2018		117,752		$	63.98