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Leases (Tables)
 9 Months Ended
Jun. 30, 2021
Leases [Abstract]  
Summary of ROU assets and lease liabilities
June 30,
2021		September 30,
2020
Right-of-use assets:
   Other assets$10.0 $11.9 
Lease liabilities:
   Other current liabilities$2.1 $2.2 
   Other liabilities9.2 11.0 
      Total liabilities$11.3 $13.2 
Lessee, operating lease, liability, maturity
June 30,
2021
Remaining Fiscal 2021$0.7 
Fiscal 20222.8 
Fiscal 20232.5 
Fiscal 20241.9 
Fiscal 20252.0 
Thereafter2.7 
   Total future minimum payments12.6 
   Less: Implied interest(1.3)
      Total lease liabilities$11.3 
Lease, Cost
Three Months Ended
June 30,		Nine Months Ended
June 30,
2021202020212020
Operating lease expense$0.9 $1.0 $2.9 $3.0 
Variable lease expense0.2 0.2 0.50.5