Summary of Significant Accounting Policies (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2020 USD ($) engine	Jun. 30, 2020 USD ($) engine	Jun. 30, 2019 USD ($) engine
Property, Plant and Equipment [Line Items]
Number of assets impaired | engine		2	4
Asset write-down		$ 9.1	$ 4.4
Contingencies related to COVID-19
Property, Plant and Equipment [Line Items]
Number of assets impaired | engine	2
Asset write-down	$ 0.5
Reduction to revenue, rent concessions	$ 3.1