Acquisitions and Discontinued Operations - Wind-Down of the Heat Transfer Business - Assets and Liabilities of Discontinued Operations (Details) - Discontinued operations, disposed of by sale - SPX Heat Transfer Business - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
ASSETS
Accounts receivable, net	$ 0.1	$ 0.1
Other current assets	0.2	0.2
Other assets	0.2	0.2
Total assets - discontinued operations	0.5	0.5
LIABILITIES
Accounts payable	0.3	0.2
Accrued expenses	0.1	0.3
Total liabilities - discontinued operations	$ 0.4	$ 0.5