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Revenues from Contracts - Disaggregated Revenues (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 1,559.5 | $ 1,520.9 | $ 1,512.6
Contract Accounts Receivable | 260.7 | 259.7 |
Increase (decrease) in accounts receivable | 1.0 |  |
Contract assets | 81.1 | 63.1 |
Increase (decrease) in contract with customer, asset, net, current | 18.0 |  |
Contract Liabilities - current | (103.5) | (100.5) |
Increase (decrease) in contract with customer, liability, current | (3.0) |  |
Contract liabilities - non-current | (3.4) | (3.3) |
Increase (decrease) in contract with customer, liability, noncurrent | (0.1) |  |
Net contract balance | 234.9 | 219.0 |
Increase in contract with customers, net | 15.9 |  |
Transferred at Point in Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 974.1 | 998.7 | 950.9
Transferred over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 585.4 | 522.2 | 561.7
Cooling |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 297.0 | 284.2 | 281.7
Boilers, comfort heating, and ventilation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 293.7 | 309.0 | 300.4
Underground locators, inspection and rehabilitation equipment, and robotic systems |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 217.8 | 194.3 | 159.1
Signal monitoring, obstruction lighting, and bus fare collection systems |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 169.5 | 190.6 | 161.8
Power transformers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 427.4 | 403.4 | 373.8
Process cooling equipment and services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 150.9 | 150.3 | 186.7
South African projects |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3.2 | (10.9) | 49.1
South Africa |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 4.0 | (6.1) | 72.6
HVAC |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 590.7 | 593.2 | 582.1
HVAC | Transferred at Point in Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 590.7 | 593.2 | 582.1
HVAC | Transferred over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
HVAC | Cooling |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 297.0 | 284.2 | 281.7
HVAC | Boilers, comfort heating, and ventilation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 293.7 | 309.0 | 300.4
HVAC | Underground locators, inspection and rehabilitation equipment, and robotic systems |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 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
HVAC | Power transformers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
HVAC | Process cooling equipment and services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
HVAC | South African projects |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Detection and Measurement |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 387.3 | 384.9 | 320.9
Detection and Measurement | Transferred at Point in Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 341.9 | 357.1 | 307.3
Detection and Measurement | Transferred over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 45.4 | 27.8 | 13.6
Detection and Measurement | Cooling |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 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
Detection and Measurement | Underground locators, inspection and rehabilitation equipment, and robotic systems |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 217.8 | 194.3 | 159.1
Detection and Measurement | Signal monitoring, obstruction lighting, and bus fare collection systems |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 169.5 | 190.6 | 161.8
Detection and Measurement | Power transformers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Detection and Measurement | Process cooling equipment and services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Detection and Measurement | South African projects |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Engineered Solutions |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 577.5 | 548.9 | 537.0
Engineered Solutions | Transferred at Point in Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 41.3 | 48.4 | 61.5
Engineered Solutions | Transferred over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 536.2 | 500.5 | 475.5
Engineered Solutions | Cooling |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Engineered Solutions | Boilers, comfort heating, and ventilation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Engineered Solutions | Underground locators, inspection and rehabilitation equipment, and robotic systems |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Engineered Solutions | Signal monitoring, obstruction lighting, and bus fare collection systems |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Engineered Solutions | Power transformers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 427.4 | 403.4 | 373.8
Engineered Solutions | Process cooling equipment and services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 150.1 | 145.5 | 163.2
Engineered Solutions | South African projects |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Other |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 4.0 | (6.1) | 72.6
Other | Transferred at Point in Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.2 | 0.0 | 0.0
Other | Transferred over Time |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 3.8 | (6.1) | 72.6
Other | Cooling |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Other | Boilers, comfort heating, and ventilation |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 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
Other | Signal monitoring, obstruction lighting, and bus fare collection systems |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Other | Power transformers |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.0 | 0.0 | 0.0
Other | Process cooling equipment and services |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | 0.8 | 4.8 | 23.5
Other | South African projects |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues | $ 3.2 | (10.9) | $ 49.1
Other | Large Power Projects | Revisions in estimates for large power projects | South Africa |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Revenues |  | $ 23.5 |

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