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Condensed Consolidating Financial Statements - Condensed Consolidating Statement of Operations and Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Oct. 01, 2017 | Jun. 25, 2017 | Mar. 26, 2017 | Dec. 25, 2016 | Sep. 25, 2016 | Jun. 26, 2016 | Mar. 27, 2016 | Dec. 31, 2017 | Dec. 25, 2016 | Dec. 27, 2015
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  | $ 346.4 | $ 348.1 | $ 354.2
Product sales |  |  |  |  |  |  |  |  | 405.5 | 320.6 | 302.9
Total revenues | $ 202.2 | $ 196.2 | $ 185.7 | $ 167.8 | $ 182.1 | $ 165.4 | $ 168.2 | $ 153.0 | 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 | 56.7 | 48.1 | 47.4 | 45.1 | 46.6 | 25.9 | 45.2 | 35.9 | 197.3 | 153.6 | 161.8
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 185.3 | 158.3 | 150.1
Research and development expenses |  |  |  |  |  |  |  |  | 17.8 | 13.9 | 16.2
Operating loss from continuing operations | (13.2) | 3.1 | 2.6 | 1.7 | 4.6 | (13.0) | 0.0 | (10.2) | (5.8) | (18.6) | (4.5)
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest income (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 | (11.7) | 0.2 | 1.8 | 1.5 | 0.8 | 1.9 | 1.8 | 3.6 | (8.2) | 8.1 | (11.4)
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | (42.6) | (60.4) | (33.2)
Loss from discontinued operations |  |  |  |  |  |  |  |  | (0.1) | (0.1) | 53.0
Equity in net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net income (loss) | $ (22.2) | $ (4.3) | $ (6.2) | $ (10.0) | $ (4.3) | $ (23.6) | $ (10.4) | $ (22.2) | (42.7) | (60.5) | 19.8
Comprehensive income (loss) |  |  |  |  |  |  |  |  | (42.4) | (60.8) | 20.1
Eliminations |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Product sales |  |  |  |  |  |  |  |  | (14.7) | (7.8) | (15.7)
Total revenues |  |  |  |  |  |  |  |  | (14.7) | (7.8) | (15.7)
Cost of service revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Cost of product sales |  |  |  |  |  |  |  |  | (14.7) | (7.8) | (15.7)
Total costs |  |  |  |  |  |  |  |  | (14.7) | (7.8) | (15.7)
Gross profit |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Research and development expenses |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Operating loss from continuing operations |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest income (expense), net |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other income (expense), net |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Total other expense, net |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Loss from continuing operations before income taxes |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Provision (benefit) for income taxes from continuing operations |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Loss from discontinued operations |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Equity in net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | (15.6) | 12.6 | 8.3
Net income (loss) |  |  |  |  |  |  |  |  | (15.6) | 12.6 | 8.3
Comprehensive income (loss) |  |  |  |  |  |  |  |  | (15.9) | 12.9 | 8.2
Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Product sales |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Total revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Cost of service revenues |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Cost of product sales |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Total costs |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Gross profit |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 9.1 | 6.3 | 10.1
Research and development expenses |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Operating loss from continuing operations |  |  |  |  |  |  |  |  | (9.1) | (6.3) | (10.1)
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest income (expense), net |  |  |  |  |  |  |  |  | (28.9) | (34.6) | (35.8)
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  | (17.3) | 0.2 | (3.4)
Other income (expense), net |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Total other expense, net |  |  |  |  |  |  |  |  | (46.2) | (34.4) | (39.2)
Loss from continuing operations before income taxes |  |  |  |  |  |  |  |  | (55.3) | (40.7) | (49.3)
Provision (benefit) for income taxes from continuing operations |  |  |  |  |  |  |  |  | 0.4 | (0.1) | (17.8)
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | (55.7) | (40.6) | (31.5)
Loss from discontinued operations |  |  |  |  |  |  |  |  | (0.1) | (0.1) | 71.8
Equity in net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 13.1 | (19.8) | (20.5)
Net income (loss) |  |  |  |  |  |  |  |  | (42.7) | (60.5) | 19.8
Comprehensive income (loss) |  |  |  |  |  |  |  |  | (42.4) | (60.8) | 20.1
Subsidiary Guarantors on a Combined Basis |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  | 334.3 | 330.9 | 339.0
Product sales |  |  |  |  |  |  |  |  | 360.2 | 273.8 | 262.3
Total revenues |  |  |  |  |  |  |  |  | 694.5 | 604.7 | 601.3
Cost of service revenues |  |  |  |  |  |  |  |  | 238.6 | 244.0 | 255.5
Cost of product sales |  |  |  |  |  |  |  |  | 274.4 | 225.0 | 203.1
Total costs |  |  |  |  |  |  |  |  | 513.0 | 469.0 | 458.6
Gross profit |  |  |  |  |  |  |  |  | 181.5 | 135.7 | 142.7
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 163.6 | 142.3 | 130.8
Research and development expenses |  |  |  |  |  |  |  |  | 16.6 | 13.5 | 15.7
Operating loss from continuing operations |  |  |  |  |  |  |  |  | 1.3 | (20.1) | (3.8)
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest income (expense), net |  |  |  |  |  |  |  |  | 0.2 | (0.1) | (0.1)
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other income (expense), net |  |  |  |  |  |  |  |  | 0.2 | 0.2 | (3.3)
Total other expense, net |  |  |  |  |  |  |  |  | 0.4 | 0.1 | (3.4)
Loss from continuing operations before income taxes |  |  |  |  |  |  |  |  | 1.7 | (20.0) | (7.2)
Provision (benefit) for income taxes from continuing operations |  |  |  |  |  |  |  |  | (8.9) | 7.0 | 4.4
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 10.6 | (27.0) | (11.6)
Loss from discontinued operations |  |  |  |  |  |  |  |  | 0.0 | 0.0 | (21.1)
Equity in net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 2.5 | 7.2 | 12.2
Net income (loss) |  |  |  |  |  |  |  |  | 13.1 | (19.8) | (20.5)
Comprehensive income (loss) |  |  |  |  |  |  |  |  | 13.1 | (19.8) | (20.5)
Non-Guarantors on a Combined Basis |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  | 12.1 | 17.2 | 15.2
Product sales |  |  |  |  |  |  |  |  | 60.0 | 54.6 | 56.3
Total revenues |  |  |  |  |  |  |  |  | 72.1 | 71.8 | 71.5
Cost of service revenues |  |  |  |  |  |  |  |  | 8.9 | 11.8 | 11.0
Cost of product sales |  |  |  |  |  |  |  |  | 47.4 | 42.1 | 41.4
Total costs |  |  |  |  |  |  |  |  | 56.3 | 53.9 | 52.4
Gross profit |  |  |  |  |  |  |  |  | 15.8 | 17.9 | 19.1
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 12.6 | 9.7 | 9.2
Research and development expenses |  |  |  |  |  |  |  |  | 1.2 | 0.4 | 0.5
Operating loss from continuing operations |  |  |  |  |  |  |  |  | 2.0 | 7.8 | 9.4
Other income (expense): |  |  |  |  |  |  |  |  |  |  |
Interest income (expense), net |  |  |  |  |  |  |  |  | 0.1 | 0.0 | (0.1)
Gain (loss) on extinguishment of debt |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Other income (expense), net |  |  |  |  |  |  |  |  | 0.7 | 0.6 | 2.6
Total other expense, net |  |  |  |  |  |  |  |  | 0.8 | 0.6 | 2.5
Loss from continuing operations before income taxes |  |  |  |  |  |  |  |  | 2.8 | 8.4 | 11.9
Provision (benefit) for income taxes from continuing operations |  |  |  |  |  |  |  |  | 0.3 | 1.2 | 2.0
Income (loss) from continuing operations |  |  |  |  |  |  |  |  | 2.5 | 7.2 | 9.9
Loss from discontinued operations |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 2.3
Equity in net income (loss) of subsidiaries |  |  |  |  |  |  |  |  | 0.0 | 0.0 | 0.0
Net income (loss) |  |  |  |  |  |  |  |  | 2.5 | 7.2 | 12.2
Comprehensive income (loss) |  |  |  |  |  |  |  |  | $ 2.8 | $ 6.9 | $ 12.3

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