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INDEBTEDNESS - Debt Details (Details) - USD ($)	9 Months Ended
	Oct. 02, 2021	Dec. 31, 2020
Debt
Balance at the beginning of the period	$ 412,400,000
Borrowings	388,700,000
Repayments	(551,500,000)
Other	(2,000,000.0)
Balance at the end of the period	247,600,000
Less: short-term debt	2,300,000	$ 101,200,000
Less: current maturities of long-term debt	11,400,000	7,200,000
Long-term debt	233,900,000	304,000,000.0
Outstanding borrowings	247,600,000	412,400,000
Trade receivables financing arrangement
Debt
Balance at the beginning of the period	28,000,000.0
Borrowings	179,000,000.0
Repayments	(207,000,000.0)
Other	0
Balance at the end of the period	0
Maximum borrowing capacity	50,000,000.0
Outstanding borrowings	0	28,000,000.0
Other indebtedness
Debt
Balance at the beginning of the period	6,000,000.0
Borrowings	600,000
Repayments	(900,000)
Other	(2,300,000)
Balance at the end of the period	3,400,000
Outstanding borrowings	3,400,000	6,000,000.0
Purchase card programs	2,300,000	1,700,000
Capital lease obligations	1,100,000	2,600,000
Revolving loans | Current Revolving SPX Facilities
Debt
Balance at the beginning of the period	129,800,000
Borrowings	209,100,000
Repayments	(338,900,000)
Other	0
Balance at the end of the period	0
Outstanding borrowings	0	129,800,000
Term loan | Current SPX Term Loan Facilities
Debt
Balance at the beginning of the period	248,600,000
Borrowings	0
Repayments	(4,700,000)
Other	300,000
Balance at the end of the period	244,200,000
Original loan balance	250,000,000.0
Debt issuance costs	1,100,000	1,400,000
Outstanding borrowings	$ 244,200,000	$ 248,600,000
Term loan | Current SPX Term Loan Facilities | 2021
Debt
Periodic payment (as a percent of principal)	0.625%
Term loan | Current SPX Term Loan Facilities | 2022 and 2023
Debt
Periodic payment (as a percent of principal)	1.25%
Term loan | Current SPX Term Loan Facilities | 2024
Debt
Periodic payment (as a percent of principal)	1.25%

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