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Goodwill And Intangible Assets (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jun. 28, 2020
Jun. 30, 2019
Jun. 28, 2020
Jun. 30, 2019
Sep. 30, 2019
Intangible Assets [Line Items]          
Goodwill $ 1,327.9   $ 1,327.9   $ 1,328.1
Impairment of indefinite lived intangible assets 0.0 $ 0.0 24.2 $ 0.0  
Amortization expense 16.9 $ 16.4 $ 50.9 66.6  
Coevorden Operations          
Intangible Assets [Line Items]          
Percentage by which reporting units exceeded carrying values     17.00%    
Impairment of definite lived intangible assets     $ 7.6    
Tradenames | Coevorden Operations          
Intangible Assets [Line Items]          
Impairment of indefinite lived intangible assets     16.6    
Indefinite-lived intangible assets 3.3   3.3    
GPC          
Intangible Assets [Line Items]          
Goodwill $ 430.1   $ 430.1   $ 430.4
HPC          
Intangible Assets [Line Items]          
Amortization expense       $ 15.5