REVENUE (Tables)

12 Months Ended

Dec. 31, 2020

Revenue from Contract with Customer [Abstract]

Sales by Product Category

The Company’s sales by product category for its historical segments were as follows (in millions):

	Year Ended December 31,
	2020		2019		2018
Historic Office Segment
Office Systems	$	359.1	$	449.4	$	439.2
Seating	101.0		131.2		131.0
Files and Storage	82.1		104.9		92.0
Ancillary	201.0		134.4		91.9
Other	32.5		53.9		43.0
Total Historical Office Segment	$	775.7	$	873.8	$	797.1
Lifestyle Segment
Studio	374.8		439.9		395.2
Coverings	85.9		114.4		110.0
Total Lifestyle Segment	$	460.7	$	554.3	$	505.2
Total Sales	$	1,236.4	$	1,428.1	$	1,302.3

Summary of Changes in the Allowance for Doubtful Accounts

The following table summarizes the changes in the allowance for doubtful accounts for the periods presented (in millions):

	Balance at Beginning of Year	Provision	Charge-Offs	Other	Balance at End of Year
Year ended December 31, 2018	4.0	0.1	(0.4)	—	3.7
Year ended December 31, 2019	3.7	0.9	(0.7)	0.1	4.0
Year ended December 31, 2020	4.0	1.3	(0.5)	0.1	4.9