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Revenues from Contracts - Narrative (Details) - USD ($)	3 Months Ended										12 Months Ended
	Dec. 31, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 31, 2018	Sep. 29, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jul. 01, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues	$ 444,600,000	$ 364,800,000	$ 372,400,000	$ 343,600,000	$ 445,000,000.0	$ 362,500,000	$ 379,200,000	$ 351,900,000			$ 1,525,400,000	$ 1,538,600,000	$ 1,425,800,000
Change in net contract balance											(53,400,000)
Revenue recognized related to contract liabilities											63,100,000
Transferred over Time
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											523,700,000	582,600,000
South Africa
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											(6,100,000)	72,700,000	56,900,000
Large Power Projects | South Africa | Reportable and other operating segments | Revisions in estimates for large power projects
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											0
All Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											(1,600,000)	98,600,000	93,800,000
All Other | Transferred over Time
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											(4,600,000)	93,500,000
All Other | Large Power Projects | South Africa | Reportable and other operating segments | Revisions in estimates for large power projects
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues			(6,000,000.0)	$ (17,500,000)					$ (23,400,000)	$ (13,500,000)	(23,500,000)	(2,700,000)	(36,900,000)
All Other | Large Power Projects | South Africa | Reportable and other operating segments | Revisions in estimates for large power projects | Alstom GE
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues			$ (6,000,000.0)
HVAC reportable segment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											$ 593,200,000	582,100,000	511,000,000.0
Customer contract terms											The typical length of a contract is one to three months and payment terms are generally 15 to 60 days after shipment to the customer.
HVAC reportable segment | Transferred over Time
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											$ 0	0
Detection and Measurement reportable segment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											$ 384,900,000	320,900,000	260,300,000
Customer contract terms											These product lines have varying contract lengths ranging from one to eighteen months (with the longer term contracts generally associated with our bus fare collection systems and signal monitoring products lines), with the typical duration being one to three months.
Detection and Measurement reportable segment | Transferred over Time
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											$ 27,800,000	13,600,000
Engineered Solutions reportable segment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											$ 548,900,000	537,000,000.0	$ 560,700,000
Customer contract terms											The length of customer contract is generally 6 to 12 months for our power transformers business and 6 to 18 months for our process cooling business. Payments on longer-term contracts are generally commensurate with milestones defined in the related contract, while payments for the replacement/spare parts contracts typically occur 30 to 60 days after delivery.
Engineered Solutions reportable segment | Transferred over Time
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											$ 500,500,000	475,500,000
Power transformers
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											403,400,000	373,800,000
Power transformers | All Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											0	0
Power transformers | HVAC reportable segment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											0	0
Power transformers | Detection and Measurement reportable segment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											0	0
Power transformers | Engineered Solutions reportable segment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											403,400,000	373,800,000
Process cooling equipment, services, and heat exchangers
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											154,800,000	212,700,000
Process cooling equipment, services, and heat exchangers | All Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											9,300,000	49,500,000
Process cooling equipment, services, and heat exchangers | HVAC reportable segment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											0	0
Process cooling equipment, services, and heat exchangers | Detection and Measurement reportable segment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											0	0
Process cooling equipment, services, and heat exchangers | Engineered Solutions reportable segment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											$ 145,500,000	163,200,000
SPX Heat Transfer Business | Engineered Solutions reportable segment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Customer contract terms											The length of customer contract is generally 6 to 18 months for our heat exchanger business.
South African projects
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											$ (10,900,000)	49,100,000
South African projects | All Other
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											(10,900,000)	49,100,000
South African projects | HVAC reportable segment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											0	0
South African projects | Detection and Measurement reportable segment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											0	0
South African projects | Engineered Solutions reportable segment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenues											$ 0	$ 0
Customer contract terms											The large contracts in our South African business relate to the construction of two large power plants that have a length in excess of 10 years.

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