Revenue

3 Months Ended

Mar. 31, 2021

Revenue from Contract with Customer [Abstract]

Revenue

Note 4 - Revenue

The following table presents details deemed most relevant to the users of the financial statements about total revenue for the three months ended March 31, 2021 and 2020, respectively:

	Three Months Ended						Three Months Ended
	March 31, 2021						March 31, 2020
	Mobile		Process		Total		Mobile		Process		Total
United States	$	242.9	$	186.2	$	429.1	$	238.2	$	192.6	$	430.8
Americas excluding United States	48.8		43.2		92.0		48.8		35.0		83.8
Europe / Middle East / Africa	127.1		127.2		254.3		108.7		115.6		224.3
China	34.4		124.3		158.7		21.8		81.0		102.8
Asia-Pacific excluding China	51.3		40.0		91.3		49.2		32.5		81.7
Net sales	$	504.5	$	520.9	$	1,025.4	$	466.7	$	456.7	$	923.4

When reviewing revenue by sales channel, the Company separates net sales to original equipment manufacturers ("OEMs") from sales to distributors and end users. The following table presents the percent of revenue by sales channel for the three months ended March 31, 2021 and 2020, respectively:

	Three Months Ended	Three Months Ended
Revenue by sales channel	March 31, 2021	March 31, 2020
Original equipment manufacturers	61%	59%
Distribution/end users	39%	41%

In addition to disaggregating revenue by segment, geography and by sales channel as shown above, the Company believes information about the timing of transfer of goods or services, type of customer and distinguishing service revenue from product sales is also relevant. During the three months ended March 31, 2021 and March 31, 2020, approximately 9% and 12%, respectively, of total net sales were recognized on an over-time basis because of the continuous transfer of control to the customer, with the remainder recognized as of a point in time. Approximately 4% and 5% of total net sales represented service revenue during each of the three months ended March 31, 2021 and March 31, 2020, respectively. Finally, the United States ("U.S.") government or its contractors represented approximately 7% and 8% of total net sales during the three months ended March 31, 2021 and March 31, 2020, respectively.

Remaining Performance Obligations:

Remaining performance obligations represent the transaction price of orders meeting the definition of a contract for which work has not been performed and excludes unexercised contract options. Performance obligations having a duration of more than one year are concentrated in contracts for certain products and services provided to the U.S. government or its contractors. The aggregate amount of the transaction price allocated to remaining performance obligations for such contracts with a duration of more than one year was approximately $388.5 million at March 31, 2021.

Unbilled Receivables:

The following table contains a rollforward of unbilled receivables for the three months ended March 31, 2021:

	March 31, 2021
Beginning balance, January 1	$	110.9
Additional unbilled revenue recognized	91.3
Less: amounts billed to customers	(88.9)
Ending balance	$	113.3

There were no impairment losses recorded on unbilled receivables for the three months ended March 31, 2021.