CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) $ in Millions	9 Months Ended
Sep. 27, 2014 USD ($)
Statement of Cash Flows [Abstract]
Repurchase of senior notes, premiums paid	$ 30.6

Represents the amount of cash outflow for premiums paid on repurchase of senior notes during the period.

No definition available.

Name:	spxc_PaymentsOfPremiumsOnRepurchaseOfSeniorNotes
Namespace Prefix:	spxc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration