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REVENUES FROM CONTRACTS - Disaggregated Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jul. 03, 2021 | Jun. 27, 2020 | Jul. 03, 2021 | Jun. 27, 2020
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 296.7 | $ 258.0 | $ 584.6 | $ 514.8
Transferred at Point in Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 267.8 | 227.2 | 518.7 | 438.4
Transferred over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 28.9 | 30.8 | 65.9 | 76.4
Package and process cooling equipment and services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 111.5 | 109.9 | 213.4 | 212.1
Boilers, comfort heating, and ventilation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 73.9 | 55.7 | 147.8 | 116.3
Underground locators, inspection and rehabilitation equipment, and robotic systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 65.9 | 47.3 | 133.3 | 96.0
Signal monitoring, obstruction lighting, and bus fare collection systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 45.3 | 44.8 | 89.5 | 88.0
South African projects |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.1 | 0.3 | 0.6 | 2.4
HVAC |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 185.4 | 165.2 | 361.0 | 328.0
HVAC | Transferred at Point in Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 166.3 | 141.5 | 320.7 | 269.0
HVAC | Transferred over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 19.1 | 23.7 | 40.3 | 59.0
HVAC | Package and process cooling equipment and services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 111.5 | 109.5 | 213.2 | 211.7
HVAC | Boilers, comfort heating, and ventilation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 73.9 | 55.7 | 147.8 | 116.3
HVAC | Underground locators, inspection and rehabilitation equipment, and robotic systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
HVAC | Signal monitoring, obstruction lighting, and bus fare collection systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
HVAC | South African projects |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Detection and Measurement |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 111.2 | 92.1 | 222.8 | 184.0
Detection and Measurement | Transferred at Point in Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 101.5 | 85.7 | 198.0 | 169.2
Detection and Measurement | Transferred over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 9.7 | 6.4 | 24.8 | 14.8
Detection and Measurement | Package and process cooling equipment and services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Detection and Measurement | Boilers, comfort heating, and ventilation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Detection and Measurement | Underground locators, inspection and rehabilitation equipment, and robotic systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 65.9 | 47.3 | 133.3 | 96.0
Detection and Measurement | Signal monitoring, obstruction lighting, and bus fare collection systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 45.3 | 44.8 | 89.5 | 88.0
Detection and Measurement | South African projects |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.1 | 0.7 | 0.8 | 2.8
Other | Transferred at Point in Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.2
Other | Transferred over Time |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.1 | 0.7 | 0.8 | 2.6
Other | Package and process cooling equipment and services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.4 | 0.2 | 0.4
Other | Boilers, comfort heating, and ventilation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Other | Underground locators, inspection and rehabilitation equipment, and robotic systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Other | Signal monitoring, obstruction lighting, and bus fare collection systems |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | 0.0 | 0.0 | 0.0 | 0.0
Other | South African projects |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Revenues | $ 0.1 | $ 0.3 | $ 0.6 | $ 2.4

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