Summary of Significant Accounting Policies - Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Millions	Jan. 01, 2019	Dec. 31, 2019
Accounting Pronouncements
Lease, Practical Expedients, Package	true
Lease, Practical Expedient, Land Easement	true
Lease, Practical Expedient, Use of Hindsight	false
Right-of-use assets		$ 26.5
Lease liability		$ 29.5
Operating Lease, Liability, Statement of Financial Position	us-gaap:OperatingLeaseLiabilityCurrent us-gaap:OperatingLeaseLiabilityNoncurrent	us-gaap:OperatingLeaseLiabilityCurrent us-gaap:OperatingLeaseLiabilityNoncurrent
ASU 2016-02
Accounting Pronouncements
Change in Accounting Principle, Accounting Standards Update, Adopted	true
New Accounting Pronouncement or Change in Accounting Principle, Prior Period Not Restated	true
ASU 2016-02 | Adjustment
Accounting Pronouncements
Right-of-use assets	$ 23.9
Lease liability	$ 25.0