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Restructuring (Tables)
 12 Months Ended
Dec. 31, 2021
Restructuring And Related Activities [Abstract]  
Summary of Activity Relating to Restructuring Plan Liabilities

The following table summarizes activity relating to restructuring plan liabilities (in millions of dollars):

 

 

 

Year Ended December 31,

 

 

 

2021

 

 

2020

 

Beginning balance

 

$

1.4

 

 

$

—

 

Restructuring costs

 

 

—

 

 

 

12.4

 

Cash payments

 

 

(0.6

)

 

 

(6.1

)

Other adjustments1

 

 

(0.8

)

 

 

(4.9

)

Ending balance

 

$

—

 

 

$

1.4

 

 

 

1

In December 2020, March 2021 and May 2021, we revised our production forecasts, thereby reducing the estimated number of headcount reductions necessary as compared with our initial restructuring plan. These reductions to accommodate the revised headcount requirements are included in Other adjustments with an offset to Restructuring (benefit) costs.