Right-of-Use Asset and Lease Liabilities - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) property	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Lessee, Lease, Description [Line Items]
Number of leased properties | property	22
Renewal option	5 years
Operating leases, rent expense		$ 10.3	$ 8.1
Operating lease, not yet commenced, liability	$ 54.1
Finance lease not yet commenced, liability	$ 0.7
Lease not yet commenced, term of contract	6 years 9 months 18 days
Minimum
Lessee, Lease, Description [Line Items]
Term of lease	2 months 12 days
Operating lease, not yet commenced, term of contract	3 years
Maximum
Lessee, Lease, Description [Line Items]
Term of lease	9 years
Operating lease, not yet commenced, term of contract	6 years 9 months 18 days