Operating Leases - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Net increase in operating lease liability	$ 16.3
Operating lease, weighted average remaining lease term (in years)	5 years 9 months 10 days
Operating lease, weighted average discount rate (percent)	1.84%
Three Shores
Lessee, Lease, Description [Line Items]
Net increase in operating lease liability	$ 15.1