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Acquisitions (Details) - USD ($)
$ in Millions
Mar. 10, 2020
Jun. 28, 2020
Sep. 30, 2019
Business Acquisition [Line Items]      
Goodwill   $ 1,327.9 $ 1,328.1
GPC      
Business Acquisition [Line Items]      
Goodwill   $ 430.1 $ 430.4
Omega Sea acquisition      
Business Acquisition [Line Items]      
Purchase price $ 16.9    
Omega Sea acquisition | GPC      
Business Acquisition [Line Items]      
Indefinite intangible asset 4.4    
Goodwill $ 8.6