Leases- Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019
Lessee, Lease, Description [Line Items]
Rent expense	$ 7.4
Other Assets
Lessee, Lease, Description [Line Items]
Operating lease right-of-use asset			$ 33.5
Other Liabilities
Lessee, Lease, Description [Line Items]
Operating lease liability			$ 34.3
Company Headquarters
Lessee, Lease, Description [Line Items]
Term of contract		10 years
Renewal term		10 years
Minimum
Lessee, Lease, Description [Line Items]
Term of contract		3 years
Maximum
Lessee, Lease, Description [Line Items]
Term of contract		5 years