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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) shares in Thousands, $ in Millions | 3 Months Ended
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Apr. 02, 2016 | Mar. 28, 2015
Income Statement [Abstract] |  |  |
Revenues | [1] | $ 389.3 | $ 376.3
Costs and expenses: |  |  |
Cost of products sold |  | 299.5 | 301.8
Selling, general and administrative |  | 82.2 | 114.9
Intangible amortization |  | 0.9 | 1.4
Special charges, net |  | 0.3 | 2.8
Impairment of intangible assets |  | 4.0 | 0.0
Gain on sale of dry cooling business |  | 17.9 | 0.0
Operating income (loss) |  | 20.3 | (44.6)
Other income (expense), net |  | 0.8 | (4.6)
Interest expense |  | (3.5) | (5.7)
Interest income |  | 0.2 | 0.6
Equity earnings in joint ventures |  | 0.4 | 0.0
Income (loss) from continuing operations before income taxes |  | 18.2 | (54.3)
Income tax (provision) benefit |  | (3.5) | 13.3
Income (loss) from continuing operations |  | 14.7 | (41.0)
Income from discontinued operations, net of tax |  | 0.0 | 31.4
Loss on disposition of discontinued operations, net of tax |  | (1.1) | (0.4)
Income (loss) from discontinued operations, net of tax |  | (1.1) | 31.0
Net income (loss) |  | 13.6 | (10.0)
Less: Net income (loss) attributable to noncontrolling interests |  | 0.6 | (2.9)
Net income (loss) attributable to SPX Corporation common shareholders |  | 13.0 | (7.1)
Amounts attributable to SPX Corporation common shareholders: |  |  |
Income (loss) from continuing operations, net of tax |  | 14.1 | (38.4)
Income (loss) from discontinued operations, net of tax |  | (1.1) | 31.3
Net income (loss) |  | $ 13.0 | $ (7.1)
Basic income (loss) per share of common stock: |  |  |
Income (loss) from continuing operations attributable to SPX Corporation common shareholders |  | $ 0.34 | $ (0.95)
Income (loss) from discontinued operations attributable to SPX Corporation common shareholders |  | (0.03) | 0.77
Net income (loss) per share attributable to SPX Corporation common shareholders |  | $ 0.31 | $ (0.18)
Weighted-average number of common shares outstanding — basic |  | 41,293 | 40,503
Diluted income (loss) per share of common stock: |  |  |
Income (loss) from continuing operations attributable to SPX Corporation common shareholders |  | $ 0.34 | $ (0.95)
Income (loss) from discontinued operations attributable to SPX Corporation common shareholders |  | (0.03) | 0.77
Net income (loss) per share attributable to SPX Corporation common shareholders |  | $ 0.31 | $ (0.18)
Weighted-average number of common shares outstanding — diluted |  | 41,553 | 40,503
Comprehensive loss |  | $ (25.1) | $ (140.5)
[1] | Under the percentage-of-completion method, we recognized revenues of $126.0 and $125.4 in the three months ended April 2, 2016 and March 28, 2015, respectively. Costs and estimated earnings in excess of billings on uncompleted contracts accounted for under the percentage-of-completion method were $90.6 and $106.3 as of April 2, 2016 and December 31, 2015, respectively, and are reported as a component of ‘‘Accounts receivable, net’’ in the condensed consolidated balance sheets. Billings in excess of costs and estimated earnings on uncompleted contracts accounted for under the percentage-of-completion method were $85.4 and $116.3 as of April 2, 2016 and December 31, 2015, respectively, and are reported as a component of ‘‘Accrued expenses’’ in the condensed consolidated balance sheets.

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