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Property and Equipment | 12 Months Ended
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Dec. 30, 2017
Property, Plant and Equipment [Abstract] |
Property and Equipment | Note 5: Property and Equipment Property and equipment (which are carried at cost) as of 2017 and 2016 year end are as follows:
(Amounts in millions) |  | 2017 |  |  | 2016 |
Land |  | $ | 24.5 |  |  | $ | 19.1 |
Buildings and improvements |  |  | 357.4 |  |  |  | 309.4 |
Machinery, equipment and computer software |  |  | 889.2 |  |  |  | 809.6 |
Property and equipment – gross |  |  | 1,271.1 |  |  |  | 1,138.1 |
Accumulated depreciation and amortization |  |  | (786.7) |  |  |  | (712.9) |
Property and equipment – net |  | $ | 484.4 |  |  | $ | 425.2 |
The estimated service lives of property and equipment are principally as follows:
Buildings and improvements |  | 3 to 50 years
Machinery, equipment and computer software |  | 2 to 15 years
The cost and accumulated depreciation of property and equipment under capital leases as of 2017 and 2016 year end are as follows:
(Amounts in millions) |  | 2017 |  |  | 2016 |
Buildings and improvements |  | $ | 21.4 |  |  | $ | 20.5 |
Accumulated depreciation |  |  | (14.0) |  |  |  | (12.3) |
Net book value |  | $ | 7.4 |  |  | $ | 8.2 |
Depreciation expense was $65.6 million, $61.4 million and $57.8 million in 2017, 2016 and 2015, respectively.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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