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Stock-Based Compensation
 9 Months Ended
Oct. 01, 2022
Share-Based Payment Arrangement [Abstract]  
Stock-Based Compensation Stock-Based CompensationThe Corporation measures stock-based compensation expense at grant date, based on the fair value of the award. Forms of awards issued under shareholder approved plans include stock options, restricted stock units based on a service condition ("restricted stock units"), restricted stock units based on both performance and service conditions ("performance stock units"), and shares issued under member stock purchase plans. Stock-based compensation expense related to stock options, restricted stock units, and performance stock units is recognized over the employees' requisite service periods, adjusted for an estimated forfeiture rate for those shares not expected to vest. Additionally, expense related to performance stock units is adjusted for the probability that the Corporation will perform within an established target range of cumulative profitability over a multi-year
period. In the third quarter of 2022, management's estimate of cumulative profitability in connection with various tranches of performance stock units was reduced, resulting in a decrease to the aggregate expense recognized to date, as well as to unrecognized expense.

The following table summarizes expense associated with these plans:
Three Months EndedNine Months Ended
October 1,
2022		October 2,
2021		October 1,
2022		October 2,
2021
Compensation cost$(2.1)$1.8 $6.4 $9.5 

The units granted by the Corporation had fair values as follows:
Nine Months Ended
October 1,
2022		October 2,
2021
Restricted stock units$7.0 $15.9 
Performance stock units$6.2 $6.1 

The following table summarizes unrecognized compensation expense and the weighted-average remaining service period for non-vested stock options and stock units as of October 1, 2022:
Unrecognized Compensation ExpenseWeighted-Average Remaining
Service Period (years)
Non-vested stock options$0.2 0.2
Non-vested restricted stock units$5.9 0.8
Non-vested performance stock units$2.2 1.0