11. Other Noncurrent Assets

At May 31, 2018 and 2017, other noncurrent assets consisted of the following:

	May 31,
	2018		2017
Costs in excess of billings	$	39.0	$	19.1
Assets under deferred compensation plan		35.7		32.1
Cash surrender value of life insurance		16.8		17.8
License fees		10.6		14.4
Investments in joint ventures		7.6		15.0
Other		9.2		6.5

	$	118.9	$	104.9

License Fees

In June 2011, we entered into a ten-year agreement with Unison Industries to be the exclusive worldwide aftermarket distributor for Unison's electrical components, sensors, switches and other systems for aircraft and industrial uses. In connection with the agreement, we agreed to pay Unison Industries $20.0 million for the exclusive distribution rights with $7.0 million paid in June 2011 and $1.3 million payable by January 31 of each calendar year beginning in January 2012 through 2021.

As of May 31, 2018 and 2017, the unamortized balance of the license is $5.6 million and $7.2 million, respectively, and is being amortized over a ten-year period. The current portion of the deferred payments of $1.3 million is recorded in Accrued liabilities and the long-term portion of $2.2 million is included in Other liabilities and deferred income on the Consolidated Balance Sheet.

Investments in Joint Ventures

During fiscal 2018, we sold interests in two aircraft joint ventures which were accounted for under the equity method of accounting. We received cash proceeds of $7.3 million and recognized a gain on the sale of $0.4 million. As of May 31, 2018, all of our remaining investments in aircraft joint ventures are accounted for under the cost method.

Under the terms of servicing agreements with certain of our aircraft joint ventures, we provide administrative services and technical advisory services, including aircraft evaluations, oversight and logistical support of the maintenance process and records management. We also provide evaluation and inspection services prior to the purchase of an aircraft and remarketing services with respect to the divestiture of aircraft by the joint ventures. During fiscal 2018, 2017, and 2016, we were paid $0.4 million, $1.2 million, and $0.9 million, respectively, for such services.

Distributions from joint ventures are classified as operating or investing activities in the Consolidated Statements of Cash Flows based upon an evaluation of the specific facts and circumstances of each distribution.