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Leases (Tables)
 9 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Leases [Abstract]    
Summary of ROU assets and lease liabilities
June 30,
2020
ROU assets:
   Other assets$12.6  
Lease liabilities:
   Other current liabilities$2.4  
   Other liabilities11.5  
      Total lease liabilities$13.9  
  
Lessee, operating lease, liability, maturity
June 30,
2020
Remaining Fiscal 2020$0.9  
Fiscal 20212.9  
Fiscal 20222.8  
Fiscal 20232.5  
Fiscal 20241.9  
Thereafter4.8  
   Total future minimum payments15.8  
   Less: Implied interest(1.9) 
      Total lease liabilities$13.9  
  
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