CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 99.6	$ 90.0	$ 247.0	$ 253.0
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(32.9)	(10.9)	(23.1)	(50.0)
Cash flow hedges	(1.2)	0.6	3.4	(0.7)
Defined benefit pension plans	0.5	0.4	1.5	1.5
Other comprehensive income (loss)	(33.6)	(9.9)	(18.2)	(49.2)
Comprehensive income	66.0	80.1	228.8	203.8
Add: comprehensive loss (earnings) attributable to noncontrolling interest	0.0	(0.1)	0.0	(0.1)
Comprehensive income attributable to Leggett & Platt, Inc.	$ 66.0	$ 80.0	$ 228.8	$ 203.7