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Investment in Joint Venture (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended | 3 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2012 EGS Electrical Group, LLC and subsidiaries ("EGS") M | Dec. 31, 2011 EGS Electrical Group, LLC and subsidiaries ("EGS") | Dec. 31, 2010 EGS Electrical Group, LLC and subsidiaries ("EGS") | Jul. 03, 2010 EGS Electrical Group, LLC and subsidiaries ("EGS") Nutsteel Industria Metalurgica Ltda
Investment in joint venture under equity method investment |  |  |  |  |  |  |
Percentage of interest held in joint venture |  |  |  | 44.50% |  |  |
Lag in including results in consolidated statements (in months) |  |  |  | 3 |  |  |
Net sales |  |  |  | $ 527.0 | $ 495.3 | $ 445.4 |
Gross profit |  |  |  | 221.9 | 201.5 | 189.2 |
Net income |  |  |  | 87.9 | 63.7 | 62.7 |
Capital expenditures |  |  |  | 12.0 | 16.7 | 11.9 |
Depreciation and amortization | 111.8 | 87.7 | 81.9 | 10.4 | 10.3 | 9.6 |
Dividends received by SPX |  |  |  | 35.2 | 29.4 | 30.3 |
Undistributed earnings attributable to SPX Corporation |  |  |  | 8.4 | 4.6 | 5.5 |
SPX's equity earnings in EGS |  |  |  | 39.0 | 28.7 | 28.8 |
Carrying value of investment |  |  |  | 73.5 | 68.9 |  |
Difference between investment in joint venture and proportionate share of joint venture's net assets |  |  |  | 82.9 |  |  |
Business acquisitions, net of cash paid | 34.3 | 747.5 | 114.8 |  |  |  | 35.4
Contribution made by the entity to the joint venture to acquire new business |  |  |  |  |  |  | 15.8
Condensed balance sheet information of EGS |  |  |  |  |  |  |
Current assets |  |  |  | 183.5 | 179.7 |  |
Non-current assets |  |  |  | 339.6 | 342.5 |  |
Current liabilities |  |  |  | 116.9 | 128.0 |  |
Non-current liabilities |  |  |  | $ 33.0 | $ 30.1 |  |

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