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ACQUISITIONS, DISCONTINUED OPERATIONS AND FORMATION OF SHANGHAI ELECTRIC JV (Details) In Millions, except Per Share data, unless otherwise specified | 9 Months Ended |  |  | 12 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  | 1 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended |
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Sep. 29, 2012 USD ($) | Oct. 01, 2011 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Feb. 28, 2011 B.W. Murdoch Ltd. ("Murdoch") USD ($) | Oct. 01, 2011 Clyde Union USD ($) | Sep. 29, 2012 Clyde Union USD ($) | Oct. 01, 2011 Clyde Union USD ($) | Dec. 31, 2011 Clyde Union GBP (£) | Dec. 22, 2011 Clyde Union USD ($) | Sep. 29, 2012 Clyde Union Customer lists Y | Dec. 22, 2011 Clyde Union Customer lists USD ($) | Sep. 29, 2012 Clyde Union Customer relationships Y | Dec. 22, 2011 Clyde Union Customer relationships USD ($) | Sep. 29, 2012 Clyde Union Technology Y | Dec. 22, 2011 Clyde Union Technology USD ($) | Dec. 22, 2011 Clyde Union Trademarks USD ($) | Dec. 22, 2011 Clyde Union Minimum GBP (£) | Sep. 29, 2012 Clyde Union Maximum USD ($) | Dec. 31, 2011 Clyde Union Maximum USD ($) | Dec. 22, 2011 Clyde Union Maximum GBP (£) | Mar. 31, 2011 Flow Technology reportable segment B.W. Murdoch Ltd. ("Murdoch") USD ($) | Oct. 01, 2011 Flow Technology reportable segment B.W. Murdoch Ltd. ("Murdoch") USD ($) | Sep. 29, 2012 Flow Technology reportable segment Clyde Union GBP (£) | Dec. 22, 2011 Flow Technology reportable segment Clyde Union GBP (£) | Oct. 31, 2011 Flow Technology reportable segment e&e Verfahrenstechnik GmbH (e&e) EUR (€) | Oct. 31, 2011 Flow Technology reportable segment e&e Verfahrenstechnik GmbH (e&e) EUR (€) | Mar. 31, 2012 Flow Technology reportable segment Seital USD ($) | Mar. 31, 2012 Flow Technology reportable segment Seital USD ($) | Mar. 21, 2012 Flow Technology reportable segment Seital USD ($)
Acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | £ 500.0 |  |  |  |  |
Debt assumed and other adjustments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 11.0 |  |  |  |  |
Potential earn-out payment equal to number of times of Group EBITDA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |
Deduction from Group EBITDA x 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 475.0 |  |  |  |  |  |
Cash acquired in business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.8 | 3.8 |  |  | 2.5
Debt assumed in business acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.8
Working capital settlement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.7 |  |  |  |  |  |  |
Revenues of the acquired business for the prior twelve months |  |  |  |  | 13.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 15.3 |  | 14.0 |
Purchase price of the business acquired | 30.5 | 8.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.1 |  |  |  | 11.7 |  | 28.8 |  |
Earn-out payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 250.0 |  |  |  |  | 3.5 | 3.5 |  |  |
Contribution by the sellers of acquired entity to the acquired business at the time of sale |  |  |  |  |  |  |  |  | 25.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated fair value of the contingent consideration (earn-out payment) at reporting date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.0 | 1.0 |  |  |  |  |  |  |  |  |  |
Amount of increase in goodwill | 56.7 |  |  |  |  |  | 57.9 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets acquired: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current assets, including cash and equivalents of $44.3 |  |  |  |  |  |  |  |  |  | 352.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property, plant and equipment |  |  |  |  |  |  |  |  |  | 76.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  |  |  |  | 372.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  | 378.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other assets |  |  |  |  |  |  |  |  |  | 25.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets acquired |  |  |  |  |  |  |  |  |  | 1,205.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Identifiable indefinite-lived intangible assets acquired |  |  |  |  |  |  |  |  |  |  |  | 7.5 |  | 234.4 |  | 60.1 | 76.8 |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average useful life (in years) |  |  |  |  |  |  |  |  |  |  | 1.5 |  | 30.0 |  | 27.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities assumed: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities |  |  |  |  |  |  |  |  |  | 270.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other long-term liabilities |  |  |  |  |  |  |  |  |  | 166.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities assumed |  |  |  |  |  |  |  |  |  | 436.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  |  |  | 1.8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net assets acquired |  |  |  |  |  |  |  |  |  | 767.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and equivalents included in current assets | 346.3 | 396.2 | 551.0 | 455.4 |  |  |  |  |  | 44.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated additional amortization and depreciation expense as a result of intangibles and fixed assets acquired |  |  |  |  |  | 1.1 |  | 3.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Elimination of interest expense related to the portion of long-term debt paid-off at the time of acquisition |  |  |  |  |  | 3.2 |  | 10.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Addition of interest expense related to term loans drawn in order to finance acquisition |  |  |  |  |  | 5.3 |  | 15.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Elimination of rent expense associated with a facility leased |  |  |  |  |  | 0.6 |  | 1.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reduction in bonding costs due to more favorable rates under senior credit facilities |  |  |  |  |  | 1.7 |  | 4.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pro forma information |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  | 1,269.8 |  | 3,618.4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations attributable to SPX Corporation common shareholders |  |  |  |  |  | 42.0 |  | 77.7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to SPX Corporation common shareholders |  |  |  |  |  | $ 53.5 |  | $ 103.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  |  |  |  |  | $ 0.83 |  | $ 1.54 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted (in dollars per share) |  |  |  |  |  | $ 0.83 |  | $ 1.52 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to SPX Corporation common shareholders: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic (in dollars per share) |  |  |  |  |  | $ 1.06 |  | $ 2.05 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Diluted (in dollars per share) |  |  |  |  |  | $ 1.05 |  | $ 2.02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Entity may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Compensating balance arrangements that do not legally restrict the withdrawal or usage of cash amounts may be reported as Cash and Cash Equivalents, while legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or company statements of intention with regard to particular deposits are not generally reported as cash and cash equivalents. Includes cash and cash equivalents associated with the entity's continuing operations. Excludes cash and cash equivalents associated with the disposal group (and discontinued operation). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7 -Footnote 1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3044-108585 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6361293&loc=d3e6676-107765 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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