STOCK BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 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 March 31,
	2019		2018
Stock option plan	$	2.0	$	3.0
RSUs		1.8		2.1
PSUs		0.2		1.6
ESPP		0.3		0.4
Total pre-tax expense	$	4.3	$	7.1

Stock Option Activity

Stock option activity for the three months ended March 31, 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		277,134			48.36
Exercised		(1,752	)		47.24
Forfeited		(150,367	)		86.79
Canceled or expired		(86,680	)		84.21
Outstanding as of March 31, 2019		4,934,721		$	93.62		3.9	$	2.9
Exercisable as of March 31, 2019		3,842,475		$	97.05		3.2	$	1.1

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 March 31,
	2019			2018
Stock options granted (shares)		277,134			338,334
Weighted average fair value at grant date	$	14.15		$	16.87
Assumptions:
Expected term (in years)		4.39			4.89
Expected volatility		30.58	%		25.33	%
Expected dividend yield		0.00	%		0.00	%
Risk free interest rate		2.41	%		2.57	%

Summary of RSU Activity

RSU activity for the three months ended March 31, 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		210,028			48.34
Vested and Released		(79,601	)		76.32
Forfeited		(33,248	)		72.55
Non-vested as of March 31, 2019		526,989		$	61.89		2.0	$	28.7

Summary of PSU Activity

PSU activity for the three months ended March 31, 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		145,514			48.44
Vested and Released		(63,219	)		63.35
Forfeited		(57,786	)		61.95
Non-vested as of March 31, 2019		140,017		$	48.78