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Investment in Joint Venture (Details) (USD $) In Millions, unless otherwise specified | 0 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 07, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Investment in joint venture under equity method investment |  |  |  |  |
Depreciation and amortization |  |  | $ 114.8 | $ 107.6 | $ 82.7
EGS Electrical Group, LLC and Subsidiaries ("EGS") |  |  |  |  |
Investment in joint venture under equity method investment |  |  |  |  |
Percentage of interest held in joint venture |  |  | 44.50% |  |
Lag in including results in consolidated statements |  |  | 3 months |  |
Revenues |  |  | 517.5 | 527.0 | 495.3
Gross profit |  |  | 223.3 | 221.9 | 201.5
Income from continuing operations |  |  | 89.4 | 87.9 | 63.7
Net income |  |  | 89.4 | 87.9 | 63.7
Capital expenditures |  |  | 13.3 | 12.0 | 16.7
Depreciation and amortization |  |  | 11.0 | 10.4 | 10.3
Dividends received by SPX |  |  | 30.3 | 35.2 | 29.4
Undistributed earnings attributable to SPX Corporation |  |  | 20.0 | 8.4 | 4.6
SPX's equity earnings in EGS |  |  | 41.9 | 39.0 | 28.7
Carrying value of investment |  |  | 81.8 | 73.5 |
Difference between investment in joint venture and proportionate share of joint venture's net assets |  |  | 89.4 |  |
Condensed balance sheet information of EGS |  |  |  |  |
Current assets |  |  | 180.4 | 183.5 |
Non-current assets |  |  | 336.4 | 339.6 |
Current liabilities |  |  | 108.0 | 116.9 |
Non-current liabilities |  |  | 24.0 | 33.0 |
Percentage of interest held in joint venture sold | 44.50% |  |  |  |
Proceeds from sale of interest in joint venture | 574.1 |  |  |  |
Gain on sale of interest in joint venture, net of tax |  | $ 300.0 |  |  |

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