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Leases - Summary of Leases Related to Consolidated Statement of Financial Position (Details) - USD ($)
$ in Millions
Apr. 04, 2021
Sep. 30, 2020
Assets    
Operating $ 103.0 $ 103.8
Finance 129.8 136.3
Total leased assets 232.8 240.1
Current    
Operating 24.9 22.4
Finance 12.0 12.1
Long-term    
Operating 86.2 88.8
Finance 144.4 148.4
Total lease liabilities $ 267.5 $ 271.7
Finance Lease, Right-of-Use Asset, Statement of Financial Position us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization  
Operating Lease, Liability, Current, Statement of Financial Position Other current liabilities  
Finance Lease, Liability, Current, Statement of Financial Position us-gaap:DebtCurrent  
Finance Lease, Liability, Noncurrent, Statement of Financial Position Long-term debt, net of current portion