Fair Value Measurements - Additional Information (Details) $ in Millions	9 Months Ended
	Sep. 30, 2020 USD ($) engine	Sep. 30, 2019 USD ($) engine	Dec. 31, 2019 USD ($)
Derivative [Line Items]
Fair value of notes receivable	$ 160.7		$ 39.7
Fair value of notes payable	1,333.3		1,262.6
Increase in interest expense	1.3	$ (0.5)
Asset write-down	$ 14.4	$ 11.3
Number of assets impaired | engine	2
Remaining book value	$ 27.5
Number of assets previously impaired | engine	14	11
Fair value, recurring | Fair value, inputs, Level 2 | Interest rate contract
Derivative [Line Items]
Notional amount, liability	$ 4.8
Assets at fair value			$ 1.7
Assets To Be Sold Or Parted Out
Derivative [Line Items]
Number of assets impaired | engine	10