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Leases (Tables)
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Leases [Abstract]    
Summary of ROU assets and lease liabilities
September 30,
2020
ROU assets:
   Other assets$11.9 
Lease liabilities:
   Other current liabilities$2.2 
   Other liabilities11.0 
      Total liabilities$13.2 
  
Lessee, operating lease, liability, maturity
September 30,
2020
Fiscal 2021$2.9 
Fiscal 20222.8 
Fiscal 20232.5 
Fiscal 20241.9 
Fiscal 20252.0 
Thereafter2.8 
   Total future minimum payments14.9 
   Less: Implied interest(1.7)
      Total lease liabilities$13.2 
  
Schedule of future minimum rental payments for operating leases  
September 30,
2019
Fiscal 2020$2.7 
Fiscal 20212.7 
Fiscal 20222.7 
Fiscal 20232.7 
Fiscal 20241.9 
Thereafter4.7 
   Total future minimum payments$17.4