CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net earnings	$ 104.9	$ 99.6	$ 144.5	$ 247.0
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	26.0	(32.9)	(13.7)	(23.1)
Cash flow hedges	3.4	(1.2)	0.8	3.4
Defined benefit pension plans	0.4	0.5	2.2	1.5
Other comprehensive income (loss)	29.8	(33.6)	(10.7)	(18.2)
Comprehensive income	134.7	66.0	133.8	228.8
Add: comprehensive (earnings) attributable to noncontrolling interest	(0.1)	0.0	0.0	0.0
Comprehensive income attributable to Leggett & Platt, Inc.	$ 134.6	$ 66.0	$ 133.8	$ 228.8