Basis of Presentation and Summary of Significant Accounting Policies (Details)										3 Months Ended		12 Months Ended
	Dec. 15, 2021 USD ($)	Aug. 02, 2021 USD ($)	Jun. 08, 2021 USD ($)	Apr. 19, 2021 USD ($)	Nov. 11, 2020 USD ($)	Sep. 02, 2020 USD ($)	Nov. 12, 2019 USD ($)	Jul. 03, 2019 USD ($)	Feb. 01, 2019 USD ($)	Dec. 31, 2021 USD ($) project	Oct. 02, 2021 USD ($)	Dec. 31, 2021 USD ($) project	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Oct. 01, 2021 USD ($)	Mar. 28, 2020 USD ($)
Discontinued Operations
Gain (loss) on disposition of discontinued operations, net of tax												$ 360,700,000	$ (3,700,000)	$ (4,400,000)
Business acquisition and other investments, net of cash acquired												265,200,000	104,400,000	147,100,000
Foreign currency transaction losses												(900,000)	(600,000)	(900,000)
Capitalized software, net of amortization										$ 100,000		100,000	1,300,000
Capitalized software amortization expense												1,300,000	2,500,000	2,400,000
Research and development expense												30,700,000	28,100,000	24,300,000
Depreciation expense, including amortization of capital leases												19,400,000	15,400,000	13,100,000
Interest capitalized												0	0	$ 0
Sealite
Discontinued Operations
Payment for acquisition				$ 80,300,000
Cash acquired				$ 2,300,000
Enterprise Control Systems Ltd
Discontinued Operations
Payment for acquisition		$ 39,400,000
Cash acquired		5,100,000
Deferred payment		16,800,000
Contingent consideration		8,200,000								1,500,000		1,500,000
Financial liabilities		$ 6,700,000
Cincinnati Fan
Discontinued Operations
Payment for acquisition	$ 145,200,000
Cash acquired	$ 2,500,000
ULC Robotics
Discontinued Operations
Payment for acquisition						$ 89,200,000
Cash acquired						4,000,000.0
Deferred payment						$ 45,000,000.0
Contingent consideration										24,300,000		24,300,000
Sensors & Software Inc
Discontinued Operations
Payment for acquisition					$ 15,500,000
Cash acquired					300,000
Deferred payment					3,900,000
Contingent consideration					$ 700,000					1,300,000		1,300,000	$ 700,000
Financial liabilities										$ 600,000		$ 600,000
Sabik Marine
Discontinued Operations
Cash acquired									$ 600,000
Business acquisition and other investments, net of cash acquired									$ 77,200,000
SGS Refrigeration Inc.
Discontinued Operations
Payment for acquisition								$ 11,500,000
Deferred payment																$ 1,500,000
Patterson-Kelley, LLC
Discontinued Operations
Payment for acquisition							$ 59,900,000
Buildings | Maximum
Discontinued Operations
Useful lives of property, plant and equipment (in years)												40 years
Machinery and equipment | Maximum
Discontinued Operations
Useful lives of property, plant and equipment (in years)												15 years
Machinery and equipment | Minimum
Discontinued Operations
Useful lives of property, plant and equipment (in years)												3 years
Revenue Benchmark | Product Concentration Risk | SPX Transformer Solutions, Inc.
Discontinued Operations
Concentration risk, percentage			25.00%
Discontinued operations | DBT
Discontinued Operations
Large power projects part of dispute resolution | project										2		2
Gain (loss) on disposition of discontinued operations, net of tax												$ (19,900,000)
Discontinued operations | Transformer solutions
Discontinued Operations
Transfer of all equity			$ 645,000,000.0
Discontinued operations, disposed of by sale | Transformer solutions
Discontinued Operations
Net cash proceeds received															$ 620,600,000
Gain (loss) on disposition of discontinued operations, net of tax										$ 24,500,000	$ 357,700,000	$ 382,200,000