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Revenue (Notes)
 9 Months Ended
Sep. 30, 2020
Revenue from Contract with Customer [Abstract]  
Revenue from Contract with Customer [Text Block]
The following table presents details deemed most relevant to the users of the financial statements about total revenue for the three and nine months ended September 30, 2020 and 2019, respectively:
Three Months EndedThree Months Ended
September 30, 2020September 30, 2019
MobileProcessTotalMobileProcessTotal
United States$220.7 $163.2 $383.9 $245.8 $196.0 $441.8 
Americas excluding United States45.1 36.0 81.1 54.7 41.1 95.8 
Europe / Middle East / Africa92.7 114.3 207.0 85.3 120.2 205.5 
Asia-Pacific70.1 152.5 222.6 69.3 101.6 170.9 
Net sales$428.6 $466.0 $894.6 $455.1 $458.9 $914.0 
Nine Months EndedNine Months Ended
September 30, 2020September 30, 2019
MobileProcessTotalMobileProcessTotal
United States$645.5 $529.5 $1,175.0 $778.1 $632.6 $1,410.7 
Americas excluding United States120.7 100.3 221.0 160.4 125.5 285.9 
Europe / Middle East / Africa280.2 342.8 623.0 288.2 374.3 662.5 
Asia-Pacific191.5 411.0 602.5 222.1 312.5 534.6 
Net sales$1,237.9 $1,383.6 $2,621.5 $1,448.8 $1,444.9 $2,893.7 
When reviewing revenue by sales channel, the Company separates net sales to original equipment manufacturers from sales to distributors and end users. The following table presents the percent of revenue by sales channel for the nine months ended September 30, 2020 and 2019, respectively:
Nine Months EndedNine Months Ended
Revenue by sales channelSeptember 30, 2020September 30, 2019
Original equipment manufacturers60%56%
Distribution/end users40%44%
In addition to disaggregating revenue by segment and 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 nine months ended September 30, 2020 and September 30, 2019, approximately 12% and 11%, 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 5% of total net sales represented service revenue during the nine months ended September 30, 2020 and September 30, 2019, respectively. Finally, the United States ("U.S.") government or its contractors represented approximately 9% and 8% of total net sales during the nine months ended September 30, 2020 and September 30, 2019, respectively.
Note 4 - Revenue (continued)

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 $246 million at September 30, 2020.

Unbilled Receivables:
The following table contains a rollforward of unbilled receivables for the nine months ended September 30, 2020:
September 30, 2020
Beginning balance, January 1$129.2 
Additional unbilled revenue recognized310.0 
Less: amounts billed to customers(298.1)
Ending balance$141.1 

There were no impairment losses recorded on unbilled receivables for the nine months ended September 30, 2020.