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REVENUES FROM CONTRACTS (Tables)
6 Months Ended
Jul. 03, 2021
Revenue from Contract with Customer [Abstract]  
Disaggregation of Revenue
We disaggregate revenue from contracts with customers by major product line and based on the timing of recognition for each of our reportable segments and our other operating segment, as we believe such disaggregation best depicts how the nature, amount, timing, and uncertainty of our revenues and cash flows are affected by economic factors, with such disaggregation presented below for the three and six months ended July 3, 2021 and June 27, 2020:
Three months ended July 3, 2021
Reportable Segments and OtherHVACDetection and MeasurementOtherTotal
Major product lines
Package and process cooling equipment and services$111.5 $— $— $111.5 
Boilers, comfort heating, and ventilation73.9 — — 73.9 
Underground locators, inspection and rehabilitation
 equipment, and robotic systems
— 65.9 — 65.9 
Signal monitoring, obstruction lighting, and bus fare collection systems— 45.3 — 45.3 
South African projects— — 0.1 0.1 
$185.4 $111.2 $0.1 $296.7 
Timing of Revenue Recognition
Revenues recognized at a point in time$166.3 $101.5 $— $267.8 
Revenues recognized over time19.1 9.7 0.1 28.9 
$185.4 $111.2 $0.1 $296.7 
Six months ended July 3, 2021
Reportable Segments and OtherHVACDetection and MeasurementOtherTotal
Major product lines
Package and process cooling equipment and services$213.2 $— $0.2 $213.4 
Boilers, comfort heating, and ventilation147.8 — — 147.8 
Underground locators, inspection and rehabilitation
 equipment, and robotic systems
— 133.3 — 133.3 
Signal monitoring, obstruction lighting, and bus fare collection systems— 89.5 — 89.5 
South African projects— — 0.6 0.6 
$361.0 $222.8 $0.8 $584.6 
Timing of Revenue Recognition
Revenues recognized at a point in time$320.7 $198.0 $— $518.7 
Revenues recognized over time40.3 24.8 0.8 65.9 
$361.0 $222.8 $0.8 $584.6 

Three months ended June 27, 2020
Reportable Segments and OtherHVACDetection and MeasurementOtherTotal
Major product lines
Package and process cooling equipment and services$109.5 $— $0.4 $109.9 
Boilers, comfort heating, and ventilation55.7 — — 55.7 
Underground locators and inspection and rehabilitation
 equipment
— 47.3 — 47.3 
Signal monitoring, obstruction lighting, and bus fare collection systems— 44.8 — 44.8 
South African projects— — 0.3 0.3 
$165.2 $92.1 $0.7 $258.0 
Timing of Revenue Recognition
Revenues recognized at a point in time$141.5 $85.7 $— $227.2 
Revenues recognized over time23.7 6.4 0.7 30.8 
$165.2 $92.1 $0.7 $258.0 
Six months ended June 27, 2020
Reportable Segments and OtherHVACDetection and MeasurementOtherTotal
Major product lines
Package and process cooling equipment and services$211.7 $— $0.4 $212.1 
Boilers, comfort heating, and ventilation116.3 — — 116.3 
Underground locators and inspection and rehabilitation
 equipment
— 96.0 — 96.0 
Signal monitoring, obstruction lighting, and bus fare collection systems— 88.0 — 88.0 
South African projects— — 2.4 2.4 
$328.0 $184.0 $2.8 $514.8 
Timing of Revenue Recognition
Revenues recognized at a point in time$269.0 $169.2 $0.2 $438.4 
Revenues recognized over time59.0 14.8 2.6 76.4 
$328.0 $184.0 $2.8 $514.8 
Contract with Customer, Asset and Liability Our contract balances consisted of the following as of July 3, 2021 and December 31, 2020:
Contract BalancesJuly 3, 2021December 31, 2020Change
Contract Accounts Receivable(1)
$204.5 $210.6 $(6.1)
Contract Assets25.0 32.5 (7.5)
Contract Liabilities - current(49.5)(46.3)(3.2)
Contract Liabilities - non-current(2)
(5.6)(3.4)(2.2)
Net contract balance$174.4 $193.4 $(19.0)
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(1) Included in “Accounts receivable, net” within the accompanying condensed consolidated balance sheets.

(2) Included in “Other long-term liabilities” within the accompanying condensed consolidated balance sheets.