CONSOLIDATED CONDENSED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net earnings	$ 77.9	$ 86.1
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, including acquisition of non-controlling interest	16.7	14.3
Cash flow hedges	2.3	2.5
Defined benefit pension plans	0.4	0.6
Other comprehensive income	19.4	17.4
Comprehensive income	97.3	103.5
Less: comprehensive income attributable to noncontrolling interest	0.0	0.0
Comprehensive income attributable to Leggett & Platt, Inc.	$ 97.3	$ 103.5