v3.20.4
Leases (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Lessee, Lease, Description [Line Items]      
Operating Lease, Weighted Average Remaining Lease Term 7 years   7 years
Operating Lease, Weighted Average Discount Rate, Percent 4.48%   4.40%
Operating Lease, Right-of-Use Asset $ 112.1   $ 116.3
Operating Lease, Liability, Current 23.7   23.6
Operating Lease, Liability, Noncurrent 98.4   103.0
Operating Lease, Liability 122.1   $ 126.6
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year 21.6    
Lessee, Operating Lease, Liability, Payments, Due Year Two 27.9    
Lessee, Operating Lease, Liability, Payments, Due Year Three 24.6    
Lessee, Operating Lease, Liability, Payments, Due Year Four 17.9    
Lessee, Operating Lease, Liability, Payments, Due Year Five 12.0    
Lessee, Operating Lease, Liability, Payments, Due after Year Five 41.3    
Lessee, Operating Lease, Liability, Payments, Due 145.3    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount 23.2    
Operating Lease, Cost 10.4 $ 11.0  
Variable Lease, Cost 1.5 1.2  
Short-term Lease, Cost 1.6 2.0  
Operating Lease, Payments 7.5 7.4  
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability $ 1.4 $ 0.1  
Minimum      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Term of Contract 1 year    
Maximum      
Lessee, Lease, Description [Line Items]      
Lessee, Operating Lease, Term of Contract 56 years