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IMPAIRMENT CHARGES (Goodwill) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Jun. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
reporting_unit
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Goodwill [Line Items]          
Goodwill impairment $ 0.0   $ 0.0 $ 25.4  
Goodwill value     $ 1,456.7   $ 1,388.8
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow     3.00%   3.00%
Hydraulic Cylinders Group          
Goodwill [Line Items]          
Goodwill impairment   $ 25.4   $ 25.4  
Aerospace Products Group          
Goodwill [Line Items]          
Goodwill value     $ 69.8   $ 59.5
Number of reporting units | reporting_unit     1    
Percentage of fair value in excess of carrying amount     28.00%   51.00%
Work Furniture Group          
Goodwill [Line Items]          
Goodwill value     $ 101.0   $ 97.2
Number of reporting units | reporting_unit     1    
Percentage of fair value in excess of carrying amount     85.00%   25.00%
Aerospace and Bedding          
Goodwill [Line Items]          
Number of reporting units | reporting_unit     2    
Bedding Group          
Goodwill [Line Items]          
Goodwill value     $ 912.6   $ 856.8
Percentage of fair value in excess of carrying amount     171.00%   65.00%
Less than 50%          
Goodwill [Line Items]          
Goodwill value     $ 69.8   $ 97.2
10-year Compound Annual Growth Rate Range for Sales     7.80%   2.10%
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow     3.00%   3.00%
Discount Rate Ranges     10.00%   9.00%
50%-100%          
Goodwill [Line Items]          
Goodwill value     $ 101.0   $ 916.3
10-year Compound Annual Growth Rate Range for Sales     5.50%    
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow     3.00%   3.00%
Discount Rate Ranges     9.00%    
101% - 300%          
Goodwill [Line Items]          
Goodwill value     $ 1,091.2   $ 247.7
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow     3.00%   3.00%
Greater than 300%          
Goodwill [Line Items]          
Goodwill value     $ 194.7   $ 127.6
10-year Compound Annual Growth Rate Range for Sales         6.70%
Terminal Values Long-term Growth Rate for Debt-Free Cash Flow     3.00%   3.00%
Discount Rate Ranges     9.00%   9.00%
Minimum          
Goodwill [Line Items]          
10-year Compound Annual Growth Rate Range for Sales     2.90%   1.60%
Discount Rate Ranges     8.00%   8.50%
Minimum | 50%-100%          
Goodwill [Line Items]          
10-year Compound Annual Growth Rate Range for Sales         2.00%
Discount Rate Ranges         9.00%
Minimum | 101% - 300%          
Goodwill [Line Items]          
10-year Compound Annual Growth Rate Range for Sales     3.10%   1.60%
Discount Rate Ranges     8.00%   8.50%
Minimum | Greater than 300%          
Goodwill [Line Items]          
10-year Compound Annual Growth Rate Range for Sales     2.90%    
Maximum          
Goodwill [Line Items]          
10-year Compound Annual Growth Rate Range for Sales     10.40%   6.70%
Discount Rate Ranges     10.00%   10.00%
Maximum | 50%-100%          
Goodwill [Line Items]          
10-year Compound Annual Growth Rate Range for Sales         3.60%
Discount Rate Ranges         10.00%
Maximum | 101% - 300%          
Goodwill [Line Items]          
10-year Compound Annual Growth Rate Range for Sales     3.30%   1.70%
Discount Rate Ranges     8.50%   9.50%
Maximum | Greater than 300%          
Goodwill [Line Items]          
10-year Compound Annual Growth Rate Range for Sales     10.40%