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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 30, 2018
Accounting Policies [Abstract] |
Property and Equipment at Cost and Depreciable Useful Lives | Cost and estimated useful lives of property and equipment by function are as follows:
Category |  | 2018 |  | 2017 |  | Life
|  | (In millions of dollars) |  |  |  |
Land |  | $ | 3.8 |  |  | $ | 3.8 |  |  |  | — |
Work in process |  | 12.2 |  |  | 5.3 |  |  |  | — |
Buildings and improvements |  | 65.3 |  |  | 64.9 |  |  | 15 | to | 45 years
Computer hardware and software |  | 153.3 |  |  | 154.2 |  |  | 3 | to | 12 years
Equipment, furniture and fixtures |  | 34.6 |  |  | 37.9 |  |  |  | 5 | years
Leasehold improvements |  | 25.5 |  |  | 25.7 |  |  | The lesser of the life of the lease or 5 years.
Total property and equipment |  | $ | 294.7 |  |  | $ | 291.8 |  |  |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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