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Segment Information - Net Sales Relating to Segments (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 29, 2020
Dec. 29, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Revenue from External Customer [Line Items]                      
Net sales $ 1,170.6 $ 984.3 $ 937.8 $ 871.5 $ 993.0 $ 1,022.2 $ 906.7 $ 880.3 $ 3,964.2 $ 3,802.1 $ 3,808.7
HHI                      
Revenue from External Customer [Line Items]                      
Net sales                 1,342.1 1,355.7 1,377.7
HPC                      
Revenue from External Customer [Line Items]                      
Net sales                 1,107.6 1,068.1 1,110.4
GPC                      
Revenue from External Customer [Line Items]                      
Net sales                 962.6 870.2 820.5
H&G                      
Revenue from External Customer [Line Items]                      
Net sales                 $ 551.9 $ 508.1 $ 500.1