Leases (Details) - USD ($) $ in Millions	3 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Oct. 01, 2019	Sep. 30, 2019
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Liability, Payments, Remainder of Fiscal Year	$ 2.6
Lessee, Operating Lease, Liability, Payments, Due Year Two	2.8
Lessee, Operating Lease, Liability, Payments, Due Year Three	2.7
Lessee, Operating Lease, Liability, Payments, Due Year Four	2.5
Lessee, Operating Lease, Liability, Payments, Due Year Five	1.9
Lessee, Operating Lease, Liability, Payments, Due after Year Five	4.7
Lessee, Operating Lease, Liability, Payments, Due	17.2
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	(2.1)
Operating Lease, Liability	15.1
Lessee, Operating Lease, Payments, Remainder of Fiscal Year				$ 2.7
Lessee, Operating Lease, Payments, Due Year Two				2.7
Lessee, Operating Lease, Payments, Due Year Three				2.7
Lessee, Operating Lease,Payments, Due Year Four				2.7
Lessee, Operating Lease, Payments, Due Year Five				1.9
Lessee, Operating Lease, Payments, Due Therafter				4.7
Lessee, Operating Lease, Payments, Due				$ 17.4
Operating Lease, Expense	1.1
Operating Lease, Payments	$ 0.9
Operating Lease, Weighted Average Remaining Lease Term	6 years
Operating Lease, Weighted Average Discount Rate, Percent	4.10%
Operating Leases, Rent Expense		$ 0.7
Minimum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	1 year
Maximum [Member]
Lessee, Lease, Description [Line Items]
Lessee, Operating Lease, Term of Contract	7 years
Other Assets [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset	$ 13.9
Other Current Liabilities [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Liability, Current	2.7
Other Noncurrent Liabilities [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Liability, Noncurrent	12.4
Other Liabilities [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Liability	$ 15.1
Accounting Standards Update 2016-02 [Member] | Other Assets [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Right-of-Use Asset			$ 14.8
Accounting Standards Update 2016-02 [Member] | Other Liabilities [Member]
Lessee, Lease, Description [Line Items]
Operating Lease, Liability			$ 16.0