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CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 25, 2016 | Dec. 27, 2015
Income Statement [Abstract] |  |  |
Service revenues | $ 346.4 | $ 348.1 | $ 354.2
Product sales | 405.5 | 320.6 | 302.9
Total revenues | 751.9 | 668.7 | 657.1
Cost of service revenues | 247.5 | 255.8 | 266.5
Cost of product sales | 307.1 | 259.3 | 228.8
Total costs | 554.6 | 515.1 | 495.3
Gross profit | 197.3 | 153.6 | 161.8
Selling, general and administrative expenses | 160.6 | 146.3 | 150.7
Merger and acquisition related items | 0.0 | 1.9 | 0.1
Research and development expenses | 17.8 | 13.9 | 16.2
Impairment of goodwill | 24.2 | 0.0 | 0.0
Unused office space and other restructuring | 0.5 | 10.1 | (0.7)
Operating loss from continuing operations | (5.8) | (18.6) | (4.5)
Other income (expense): |  |  |
Interest expense, net | (28.6) | (34.7) | (36.0)
Gain (loss) on extinguishment of debt | (17.3) | 0.2 | (3.4)
Other income (expense), net | 0.9 | 0.8 | (0.7)
Total other expense, net | (45.0) | (33.7) | (40.1)
Loss from continuing operations before income taxes | (50.8) | (52.3) | (44.6)
Provision (benefit) for income taxes from continuing operations | (8.2) | 8.1 | (11.4)
Income (loss) from continuing operations | (42.6) | (60.4) | (33.2)
Income (loss) from operations of discontinued component (including gain on disposal of $80.8 million for the year ended December 27, 2015) | 0.0 | (0.1) | 75.5
Income tax expense | 0.1 | 0.0 | 22.5
Income (loss) from discontinued operations | (0.1) | (0.1) | 53.0
Net income (loss) | $ (42.7) | $ (60.5) | $ 19.8
Basic income and loss per common share: |  |  |
Loss from continuing operations (in dollars per share) | $ (0.48) | $ (0.99) | $ (0.56)
Income (loss) from discontinued operations (in dollars per share) | 0.00 | 0.00 | 0.90
Net income (loss) per common share (in dollars per share) | (0.48) | (0.99) | 0.34
Diluted income and loss per common share: |  |  |
Loss from continuing operations (in dollars per share) | (0.48) | (0.99) | (0.56)
Income (loss) from discontinued operations (in dollars per share) | 0.00 | 0.00 | 0.90
Net income (loss) per common share (in dollars per share) | $ (0.48) | $ (0.99) | $ 0.34
Weighted average common shares outstanding: |  |  |
Basic (in shares) | 89.5 | 61.3 | 58.7
Diluted (in shares) | 89.5 | 61.3 | 58.7
Comprehensive Income (Loss) |  |  |
Net income (loss) | $ (42.7) | $ (60.5) | $ 19.8
Other comprehensive income (loss): |  |  |
Change in cumulative translation adjustment | 0.1 | (0.5) | 0.1
Postretirement benefit reserve adjustment net of tax expense | 0.2 | 0.2 | 0.2
Other comprehensive income (loss), net of tax | 0.3 | (0.3) | 0.3
Comprehensive income (loss) | $ (42.4) | $ (60.8) | $ 20.1

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- Definition Amount after tax of other comprehensive income (loss) attributable to parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569643-111683 + Details
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- Definition The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 730 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6420194&loc=d3e21568-108373 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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