Restructuring (Tables)

12 Months Ended

Dec. 31, 2020

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,  2020
Beginning balance	$	—
Restructuring costs		12.4
Cash payments		(6.1	)
Other adjustments1		(4.9	)
Ending balance	$	1.4

^1. In December 2020, 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 $4.9 million with an offset to Restructuring costs to accommodate the revised headcount requirements.