Consolidated Statements Of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	$ 333.9	$ 306.1	$ 292.7
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, including acquisition of noncontrolling interest	5.0	(67.0)	79.1
Cash flow hedges	7.7
Cash flow hedges		(0.3)	6.3
Defined benefit pension plans	(11.9)	(0.8)	18.7
Other comprehensive income (loss)	0.8	(68.1)	104.1
Comprehensive income	334.7	238.0	396.8
Less: comprehensive (income) attributable to noncontrolling interest	(0.1)	(0.2)	(0.1)
Comprehensive income attributable to Leggett & Platt, Inc.	$ 334.6	$ 237.8	$ 396.7