In the fourth quarter of 2020, we completed the acquisitions of A&E Medical Corporation (“A&E Medical”), a sternal closure company, and Relign Corp. (“Relign”), an arthroscopy equipment company (collectively referred to as the “2020 acquisitions”). The 2020 acquisitions were completed primarily to expand our product offerings in the CMFT and sports medicine markets. The total aggregate cash consideration paid in 2020 related to the 2020 acquisitions was $244.9 million, with an additional $145.0 million of guaranteed deferred payments to be made in 2021. We have assigned a fair value of $31.3 million for potential additional payments related to these acquisitions that are contingent on the respective acquired companies’ future product sales. The estimated fair value of the aggregate contingent payment liabilities was calculated based on the probability of achieving the specified sales growth and discounting to present value the estimated payments.

The goodwill related to the 2020 acquisitions represents the excess of the consideration transferred over the fair value of the net assets acquired. The goodwill related to the 2020 acquisitions is generated from the operational synergies and cross-selling opportunities we expect to achieve from the technologies acquired. None of the goodwill related to these acquisitions is expected to be deductible for tax purposes.

The purchase price allocations as of March 31, 2021 are preliminary. We need additional time to finalize the acquired companies’ tax returns and evaluate their tax attributes, which may change the recognized tax assets and liabilities. There may be differences between the preliminary estimates of fair value and the final acquisition accounting. The final estimates of fair value are expected to be completed as soon as possible, but no later than one year after the respective acquisition dates.

The following table summarizes the aggregate preliminary estimates of fair value of the assets acquired and liabilities assumed related to the 2020 acquisitions (in millions):

Current assets	$	33.7
Intangible assets subject to amortization:
Technology		147.9
Trademarks and trade names		1.5
Customer relationships		92.7
Other		4.9
Goodwill		189.9
Other assets		5.4
Total assets acquired		476.0
Current liabilities		4.5
Deferred income taxes		48.5
Other long-term liabilities		1.8
Total liabilities assumed		54.8
Net assets acquired	$	421.2

In the three-month period ended March 31, 2021 we adjusted the preliminary fair values that were recognized as of December 31, 2020. The adjustments primarily related to the customer relationships intangible asset and the related deferred income tax liability as we refined our estimates by analyzing historical purchasing patterns of existing customers. The adjustment did not result in a significant change to intangible asset amortization expense recognized in the three-month period ended March 31, 2021 that would have been recognized in the previous period if the adjustment were recognized as of the acquisition date.

The weighted average amortization period selected for technology, trademarks and trade names, customer relationships and other intangible assets were 13 years, 12 years, 15 years and 5 years, respectively.

We have not included pro forma information and certain other information under GAAP for the 2020 acquisitions because they did not have a material impact on our financial position or results of operations.