STOCK BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2018

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

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

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

In millions
	Years Ended December 31,
	2018		2017		2016
Selling, general and administrative - stock option plans	$	10.8	$	14.7	$	17.4
Selling, general and administrative - RSUs		7.2		5.2		0.9
Selling, general and administrative - PSUs		5.1		0.2		-
Selling, general and administrative - ESPP and Canada ESPP		1.0		1.2		2.2
Total pre-tax expense	$	24.1	$	21.3	$	20.5

Stock Option Activity

Stock option activity for the year ended December 31, 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 as of January 1, 2018		5,393,417		$	96.91
Granted		430,337			60.35
Exercised		(312,302	)		49.78
Forfeited		(267,622	)	99.21
Cancelled or expired		(347,444	)		106.94
Outstanding as of December 31, 2018		4,896,386		$	95.85		4.03	$	-
Exercisable as of December 31, 2018		3,475,528		$	96.11		3.39	$	-

Intrinsic Value of Options Exercised

The following table sets forth the intrinsic value of options exercised for the years ended December 31 2018, 2017, and 2016:

In millions
	2018		2017		2016
Total exercise intrinsic value of options exercised	$	4.7	$	4.8	$	26.0

Assumptions Used in Black-Scholes Option Pricing Model

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

	Years Ended December 31,
	2018			2017			2016
Stock options granted (shares)		430,337			456,424			1,100,492
Weighted average fair value at grant date	$	16.79		$	19.46		$	20.16
Assumptions:
Expected term (in years)		4.89			4.82			4.77
Expected volatility		25.52	%		22.68	%		18.28	%
Expected dividend yield		—	%		—	%		—	%
Risk free interest rate		2.6	%		1.9	%		1.2	%

Summary of RSU Activity

RSUs activity during the year ended December 31, 2018, is 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 as of January 1, 2018		267,297		$	89.74
Granted		312,254			61.64
Vested and Released		(59,097	)	88.99
Forfeited		(90,644	)		75.37
Non-vested as of December 31, 2018		429,810		$	72.02		1.88	$	15.8

Summary of PSU Activity

PSUs activity during the year ended December 31, 2018, is as follows:

	Number of Units			Weighted Average Grant Date Fair Value
Non-vested as of January 1, 2018		11,149		$	82.85
Granted		136,496			63.79
Vested and Released		-			-
Forfeited (including performance goal underachieving)		(32,137	)		70.47
Non-vested as of December 31, 2018		115,508		$	63.77