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STOCK BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2022
Share-Based Payment Arrangement [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 classified in SG&A resulting from stock option awards, RSUs, PSUs and ESPP included in the Consolidated Statements of Income (Loss):
In millions
Year Ended December 31,
202220212020
Stock options$0.8 $2.0 $3.2 
RSUs17.1 14.8 15.6 
PSUs6.5 9.6 5.9 
ESPP0.7 0.7 0.8 
Total$25.1 $27.1 $25.5 
Stock Option Activity
Stock option activity is summarized as follows:
Number of OptionsWeighted Average Exercise Price per ShareWeighted Average Remaining Contractual LifeTotal Aggregate Intrinsic Value
(in years)(in millions)
Outstanding as of January 1, 20221,918,530 $96.25 
Granted— $— 
Exercised(6,284)$48.53 
Forfeited(3,274)$60.76 
Cancelled or expired(740,302)$99.43 
Outstanding as of December 31, 20221,168,670 $94.61 2.01$0.4 
Exercisable as of December 31, 20221,123,409 $96.24 1.93$0.4 
Intrinsic Value of Options Exercised
The following table sets forth the intrinsic value of options exercised:
In millions
Year Ended December 31,
202220212020
Total exercise intrinsic value of options exercised$— $1.1 $0.5 
Summary of RSU Activity
RSUs activity is as follows:
Number of UnitsWeighted Average Grant Date Fair ValueWeighted Average Remaining Contractual LifeTotal Aggregate Intrinsic Value
(in years)(in millions)
Non-vested as of January 1, 2022556,322 $60.79 
Granted330,920 $56.15 
Vested and Released(250,064)$59.49 
Forfeited(53,417)$59.26 
Non-vested as of December 31, 2022583,761 $58.85 1.27$29.1 
Summary of PSU Activity
PSU activity is as follows:
Number of UnitsWeighted Average Grant Date Fair Value
Non-vested as of January 1, 2022322,342 $57.79 
Granted151,123 $56.30 
Vested and Released(74,651)$57.08 
Forfeited(15,574)$57.75 
Non-vested as of December 31, 2022383,240 $56.32