CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ (6.1)	$ 86.3	$ 39.6	$ 147.4
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	25.8	1.0	(39.7)	9.8
Cash flow hedges	3.7	0.7	(2.6)	4.6
Defined benefit pension plans	0.6	0.5	1.8	1.0
Other comprehensive income (loss)	30.1	2.2	(40.5)	15.4
Comprehensive income (loss)	24.0	88.5	(0.9)	162.8
Add: comprehensive (earnings) attributable to noncontrolling interest	0.0	(0.1)	0.1	0.0
Comprehensive income (loss) attributable to Leggett & Platt, Inc.	$ 24.0	$ 88.4	$ (0.8)	$ 162.8