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Supplementary Financial Information (Unaudited) (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract]                      
Net trade sales $ 1,332,900,000 $ 1,319,200,000 $ 1,269,600,000 $ 1,150,900,000 $ 1,182,000,000 $ 1,207,600,000 $ 845,100,000 $ 1,045,500,000 $ 5,072,600,000 $ 4,280,200,000 $ 4,752,500,000
Gross profit 265,400,000 256,100,000 269,300,000 247,500,000 267,100,000 269,700,000 146,600,000 220,700,000 1,038,300,000 904,100,000 1,024,000,000
Net earnings 105,600,000 97,200,000 112,300,000 87,500,000 108,000,000.0 107,100,000 (6,100,000) 44,100,000 402,600,000 253,100,000 314,100,000
Net earnings attributable to Leggett & Platt, Inc. common shareholders $ 105,500,000 $ 97,200,000 $ 112,200,000 $ 87,500,000 $ 108,000,000.0 $ 107,000,000.0 $ (6,100,000) $ 44,100,000 $ 402,400,000 $ 253,000,000.0 $ 314,000,000.0
Net earnings per share attributable to Leggett & Platt, Inc. common shareholders                      
Basic (in dollars per share) $ 0.77 $ 0.71 $ 0.83 $ 0.64 $ 0.79 $ 0.79 $ (0.05) $ 0.33 $ 2.95 $ 1.86 $ 2.33
Diluted (in dollars per share) $ 0.77 $ 0.71 $ 0.82 $ 0.64 $ 0.79 $ 0.79 $ (0.05) $ 0.33 $ 2.94 $ 1.86 $ 2.32
Quarterly Financial Information [Line Items]                      
Goodwill impairment                 $ 0 $ 25,400,000 $ 0
Hydraulic Cylinders Group                      
Quarterly Financial Information [Line Items]                      
Goodwill impairment             $ 25,400,000     25,400,000  
Bedding Products                      
Quarterly Financial Information Disclosure [Abstract]                      
Net trade sales                 $ 2,455,900,000 2,039,300,000 $ 2,254,300,000
Quarterly Financial Information [Line Items]                      
Gain on the sale of real estate     $ 28,200,000                
Goodwill impairment                   $ 0