SEGMENT INFORMATION - Segment Information with Corporate Costs Excluded (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) segment	Sep. 30, 2019 USD ($)
Financial information of segments
Number of reportable segments | segment			2
Sales	$ 309.4	$ 356.5	$ 923.5	$ 1,056.6
Operating profit	19.3	36.7	20.7	99.8
Operating Segments
Financial information of segments
Sales	309.4	356.5	923.5	1,056.6
Intersegment sales	2.2	2.8	7.1	8.7
Corporate
Financial information of segments
Operating profit	(2.1)	(6.6)	(28.1)	(18.3)
Office
Financial information of segments
Sales	193.2	219.1	589.9	644.5
Office | Operating Segments
Financial information of segments
Sales	193.2	219.1	589.9	644.5
Intersegment sales	0.0	0.6	0.4	1.5
Operating profit	5.4	18.3	10.1	46.8
Lifestyle
Financial information of segments
Sales	116.2	137.4	333.6	412.1
Lifestyle | Operating Segments
Financial information of segments
Sales	116.2	137.4	333.6	412.1
Intersegment sales	2.2	2.2	6.7	7.2
Operating profit	$ 16.0	$ 25.0	$ 38.7	$ 71.3