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SUBSEQUENT EVENTS
12 Months Ended
Dec. 31, 2021
Subsequent Events [Abstract]  
SUBSEQUENT EVENTS SUBSEQUENT EVENTSOn February 17, 2022, we announced the Canada Small Package Retirement Plan will cease accruals of additional benefits for future service and compensation for participants effective December 31, 2023. Upon adoption of the plan amendments, the elimination of defined benefit accruals for all current employees will trigger a pension curtailment event and the plan assets and pension benefit obligation will be remeasured.