Fair Value Measurements - Additional Information (Details) $ in Millions	6 Months Ended
	Jun. 30, 2020 USD ($) engine	Jun. 30, 2019 USD ($) engine	Dec. 31, 2019 USD ($)
Derivative [Line Items]
Fair value of notes receivable	$ 171.3		$ 39.7
Fair value of notes payable	1,498.8		1,262.6
Increase in interest expense	0.6	$ (0.4)
Asset write-down	$ 9.1	$ 4.4
Number of assets impaired | engine	2	4
Remaining book value	$ 30.5
Number of assets previously impaired | engine	12
Fair value, recurring | Fair value, inputs, Level 2 | Interest rate contract
Derivative [Line Items]
Notional amount, liability	$ 5.4
Assets at fair value			$ 1.7
Assets To Be Sold Or Parted Out
Derivative [Line Items]
Number of assets impaired | engine	5