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Summary of Significant Accounting Policies - Operating Income from Continuing Operations (Details) - USD ($) $ in Millions | 3 Months Ended
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Apr. 01, 2018 | Mar. 26, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Service revenues | $ 46.0 | $ 49.2
Product sales | 97.0 | 82.8
Total revenues | 143.0 | 132.0
Cost of service revenues | 32.9 | 35.0
Cost of product sales | 69.3 | 60.9
Total costs | 102.2 | 95.9
Gross profit | 40.8 | 36.1
Selling, general and administrative expenses | 29.8 | 30.0
Operating income from continuing operations | 7.0 | $ 1.4
Balances Without Adoption of ASC 606 |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Service revenues | 46.0 |
Product sales | 89.3 |
Total revenues | 135.3 |
Cost of service revenues | 32.9 |
Cost of product sales | 65.1 |
Total costs | 98.0 |
Gross profit | 37.3 |
Selling, general and administrative expenses | 29.8 |
Operating income from continuing operations | 3.5 |
Effect of Change Higher/(Lower) |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Service revenues | 0.0 |
Product sales | 7.7 |
Total revenues | 7.7 |
Cost of service revenues | 0.0 |
Cost of product sales | 4.2 |
Total costs | 4.2 |
Gross profit | 3.5 |
Selling, general and administrative expenses | 0.0 |
Operating income from continuing operations | $ 3.5 |

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- Definition Total costs related to goods produced and sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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