CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Total Knoll, Inc. Stockholders' Equity	Noncontrolling Interests
Beginning Balance at Dec. 31, 2016	$ 309.4	$ 0.5	$ 55.1	$ 297.0	$ (43.4)	$ 309.2	$ 0.2
Increase (Decrease) in Stockholders' Equity
Net earnings	80.2			80.2		80.2	0.0
Other comprehensive loss	(0.4)				(0.4)	(0.4)
Exercise of stock options	0.5		0.5			0.5
Stock-based compensation	9.8		9.8			9.8
Cash dividend (in dollars per share)	(29.9)			(29.9)		(29.9)
Purchase of common stock for treasury	(10.9)		(10.9)			(10.9)
Ending Balance at Dec. 31, 2017	358.7	0.5	54.5	347.3	(43.8)	358.5	0.2
Increase (Decrease) in Stockholders' Equity
Net earnings	73.3			73.3		73.3
Other comprehensive loss	(19.9)				(19.9)	(19.9)
Stock-based compensation	8.7		8.7			8.7
Cash dividend (in dollars per share)	(29.9)			(29.9)		(29.9)
Purchase of common stock for treasury	(4.4)		(4.4)			(4.4)
Ending Balance at Dec. 31, 2018	386.5	0.5	58.8	395.4	(68.4)	386.3	0.2
Increase (Decrease) in Stockholders' Equity
Net earnings	67.5			67.5		67.5
Other comprehensive loss	(1.0)				(1.0)	(1.0)
Stock-based compensation	10.8		10.8			10.8
Cash dividend (in dollars per share)	(33.2)			(33.2)		(33.2)
Purchase of common stock for treasury	(3.3)		(3.3)			(3.3)
Other	0.3		0.5			0.5	(0.2)
Ending Balance at Dec. 31, 2019	$ 427.6	$ 0.5	$ 66.8	$ 429.7	$ (69.4)	$ 427.6	$ 0.0