Leases (Details) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2020 USD ($) numberOfOperatingLeases	Mar. 31, 2020 USD ($) numberOfOperatingLeases
Lessee, Lease, Description [Line Items]
Lease expense | $	$ 1.9	$ 3.6
Number of operating leases, not yet commenced | numberOfOperatingLeases	0	0
Minimum
Lessee, Lease, Description [Line Items]
Lease term	1 year	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lease term	15 years	15 years