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Leases (Tables)
 3 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Summary of ROU assets and lease liabilities
December 31,
2020		September 30,
2020
ROU assets:
   Other assets$11.3 $11.9 
Lease liabilities:
   Other current liabilities$2.1 $2.2 
   Other liabilities10.4 11.0 
      Total liabilities$12.5 $13.2 
Lessee, operating lease, liability, maturity
December 31,
2020
Remaining Fiscal 2021$2.1 
Fiscal 20222.8 
Fiscal 20232.5 
Fiscal 20241.9 
Fiscal 20252.0 
Thereafter2.8 
   Total future minimum payments14.1 
   Less: Implied interest(1.6)
      Total lease liabilities$12.5