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Restructuring (Tables)
 9 Months Ended
Sep. 30, 2021
Restructuring And Related Activities [Abstract]  
Summary of Changes to Our 2020 Plan Liabilities

The following table summarizes the changes to our 2020 Plan liabilities during the nine months ended September 30, 2021 (in millions of dollars):

 

 

 

Nine Months Ended September 30, 2021

 

Balance as of December 31, 2020

 

$

1.4

 

Cash payments

 

 

(0.6

)

Other adjustments1

 

 

(0.8

)

Balance as of September 30, 2021

 

$

—

 

 

1

In March 2021 and May 2021, we revised our production forecast for 2021, thereby reducing the estimated number of headcount reductions necessary as compared with our initial restructuring plan. As such, included in Other adjustments is a reduction to our estimated restructuring liability of $0.8 million with an offset to Restructuring costs to accommodate the revised headcount requirements.