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REVENUES FROM CONTRACTS (Tables) | 6 Months Ended
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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 Other |  | HVAC |  | Detection and Measurement |  | Other |  | Total
Major product lines |  |  |  |  |  |  |  |
Package and process cooling equipment and services |  | $ | 111.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 111.5 |
Boilers, comfort heating, and ventilation |  | 73.9 |  |  | — |  |  | — |  |  | 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 time |  | 19.1 |  |  | 9.7 |  |  | 0.1 |  |  | 28.9 |
|  | $ | 185.4 |  |  | $ | 111.2 |  |  | $ | 0.1 |  |  | $ | 296.7 |
|  | Six months ended July 3, 2021
Reportable Segments and Other |  | HVAC |  | Detection and Measurement |  | Other |  | Total
Major product lines |  |  |  |  |  |  |  |
Package and process cooling equipment and services |  | $ | 213.2 |  |  | $ | — |  |  | $ | 0.2 |  |  | $ | 213.4 |
Boilers, comfort heating, and ventilation |  | 147.8 |  |  | — |  |  | — |  |  | 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 time |  | 40.3 |  |  | 24.8 |  |  | 0.8 |  |  | 65.9 |
|  | $ | 361.0 |  |  | $ | 222.8 |  |  | $ | 0.8 |  |  | $ | 584.6 |
|  | Three months ended June 27, 2020
Reportable Segments and Other |  | HVAC |  | Detection and Measurement |  | Other |  | Total
Major product lines |  |  |  |  |  |  |  |
Package and process cooling equipment and services |  | $ | 109.5 |  |  | $ | — |  |  | $ | 0.4 |  |  | $ | 109.9 |
Boilers, comfort heating, and ventilation |  | 55.7 |  |  | — |  |  | — |  |  | 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 time |  | 23.7 |  |  | 6.4 |  |  | 0.7 |  |  | 30.8 |
|  | $ | 165.2 |  |  | $ | 92.1 |  |  | $ | 0.7 |  |  | $ | 258.0 |
|  | Six months ended June 27, 2020
Reportable Segments and Other |  | HVAC |  | Detection and Measurement |  | Other |  | Total
Major product lines |  |  |  |  |  |  |  |
Package and process cooling equipment and services |  | $ | 211.7 |  |  | $ | — |  |  | $ | 0.4 |  |  | $ | 212.1 |
Boilers, comfort heating, and ventilation |  | 116.3 |  |  | — |  |  | — |  |  | 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 time |  | 59.0 |  |  | 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 Balances | July 3, 2021 |  | December 31, 2020 |  | Change
Contract Accounts Receivable(1) | $ | 204.5 |  |  | $ | 210.6 |  |  | $ | (6.1) |
Contract Assets | 25.0 |  |  | 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) |
___________________________ (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.

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- Definition Tabular disclosure of receivable, contract asset, and contract liability from contract with customer. Includes, but is not limited to, change in contract asset and contract liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123351226&loc=SL49130551-203045 + Details
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