Indebtedness - Summary of Debt Activity (Details) - USD ($)	3 Months Ended	12 Months Ended
	Apr. 03, 2021	Dec. 31, 2021	Dec. 31, 2020
Debt
Balance at the beginning of the period	$ 412,400,000	$ 412,400,000
Borrowings		389,500,000
Repayments		(554,000,000.0)
Other		(1,900,000)
Balance at the end of the period		246,000,000.0
Short-term debt		2,200,000	$ 101,200,000
Current maturities of long-term debt		13,000,000.0	7,200,000
Long-term debt		230,800,000	304,000,000.0
Unamortized debt issuance costs		1,000,000.0	1,400,000
Finance lease, liability		1,100,000	2,600,000
Trade receivables financing arrangement
Debt
Balance at the beginning of the period	28,000,000.0	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 under financing arrangement		50,000,000.0
Available borrowing capacity		0
Other indebtedness
Debt
Balance at the beginning of the period	6,000,000.0	6,000,000.0
Borrowings		600,000
Repayments		(1,000,000.0)
Other		(2,300,000)
Balance at the end of the period		3,300,000
Purchase card programs		2,200,000	1,700,000
Finance lease, liability		1,100,000	$ 2,600,000
Revolving loans | Current Revolving SPX Facilities
Debt
Balance at the beginning of the period	129,800,000	129,800,000
Borrowings		209,900,000
Repayments		(339,700,000)
Other		0
Balance at the end of the period		0
Term loans | Current SPX Term Loan Facilities
Debt
Balance at the beginning of the period	$ 248,600,000	248,600,000
Borrowings		0
Repayments		(6,300,000)
Other		400,000
Balance at the end of the period		242,700,000
Face amount of debt		$ 250,000,000.0
Term loans | 2021 | Current SPX Term Loan Facilities
Debt
Initial principal amount of the term loan to be repaid annually in quarterly installments (as a percent)	0.625%
Term loans | 2022 and 2023 | Current SPX Term Loan Facilities
Debt
Initial principal amount of the term loan to be repaid annually in quarterly installments (as a percent)		1.25%
Term loans | First three quarters of 2024 | Current SPX Term Loan Facilities
Debt
Initial principal amount of the term loan to be repaid annually in quarterly installments (as a percent)		1.25%