The aggregate expense charged against earnings to allocate the cost of intangible assets and liabilities (nonphysical assets and liabilities not used in production) in a systematic and rational manner to the periods expected to benefit from such assets and liabilities. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

No definition available.

Name:	cpa17_AmortizationOfIntangibleAssetsLiabilities
Namespace Prefix:	cpa17_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Intangible Assets and Liabilities - Narratives (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Finite-Lived Intangible Assets
Net amortization of intangibles	$ 9.2	$ 10.5	$ 18.5	$ 23.3
Below and above market rent intangibles
Finite-Lived Intangible Assets
(Decrease) increase in rental income	$ (0.3)	$ (0.3)	$ (0.7)	18.5
Assets held for sale \| Below-market rent \| KBR
Finite-Lived Intangible Assets
Intangible liability written off				$ 15.7