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Leases (Tables)
 6 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Leases [Abstract]    
Summary of ROU assets and lease liabilities
March 31,
2020
ROU assets:
   Other assets$13.4  
Lease liabilities:
   Other current liabilities$2.6  
   Other liabilities12.0  
      Total lease liabilities$14.6  
  
Lessee, operating lease, liability, maturity
March 31,
2020
Remaining Fiscal 2020$1.7  
Fiscal 20212.8  
Fiscal 20222.8  
Fiscal 20232.5  
Fiscal 20242.0  
Thereafter4.8  
   Total future minimum payments16.6  
   Less: Implied interest(2.0) 
      Total lease liabilities$14.6  
  
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