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Acquisitions and Discontinued Operations - Pre-tax Income (Loss) and After-tax Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Costs and expenses:      
Income from discontinued operations $ (4.5) $ (5.8) $ 0.2
Income tax (provision) benefit 1.0 0.0 (0.9)
Gain (loss) on disposition of discontinued operations, net of tax (3.7) (4.4) 3.0
Loss from discontinued operations, net of tax (3.5) (5.8) (0.7)
Discontinued operations | SPX Heat Transfer Business      
Business Acquisition [Line Items]      
Revenues 3.9 4.5 26.0
Costs and expenses:      
Cost of products sold 3.1 6.1 25.3
Selling, general and administrative 0.1 0.9 2.9
Intangible amortization expense 0.0 0.0 0.1
Special charges (credits), net 0.4 (0.4) 2.6
Other income, net 0.0 0.3 0.0
Income from discontinued operations 0.3 (1.8) (4.9)
Income tax (provision) benefit (0.1) 0.4 1.2
Gain (loss) on disposition of discontinued operations, net of tax $ 0.2 $ (1.4) $ (3.7)