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Summary Of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Estimated Useful Lives Of The Assets | Property, plant, and equipment are stated at cost, net of accumulated depreciation. Depreciation is computed on a straight-line basis over the estimated useful lives of the assets generally as follows:
| Useful Lives
Building | Up to 30 years
Building improvements | Up to 15 years
Leasehold improvements | Lesser of useful life or term of lease
Equipment and furniture | 5 years
Operating lease assets | Greater of lease term or 1 to 5 years
Computer and office equipment | 3 years
Enterprise-wide software | 5 years
Purchased software | Lesser of 3 years or life of license
The following table provides details of the property, plant, and equipment, net (in millions):
| December 31,
| 2017 |  | 2016
Property, plant, and equipment, net: |  |  |
Land | $ | 174.8 |  |  | $ | 131.7 |
Building and building/leasehold improvements | 230.5 |  |  | 199.5 |
Machinery and equipment | 224.8 |  |  | 217.7 |
Operating lease assets | 66.1 |  |  | 34.7 |
Computer and office equipment | 44.8 |  |  | 41.3 |
Capitalized software | 135.6 |  |  | 114.2 |
Construction-in-process | 83.5 |  |  | 41.2 |
Gross property, plant, and equipment | 960.1 |  |  | 780.3 |
Less: Accumulated depreciation* | (347.0 | ) |  | (321.9 | )
Total property, plant, and equipment, net | $ | 613.1 |  |  | $ | 458.4 |
*Accumulated depreciation associated with operating lease assets | $ | (13.8 | ) |  | $ | (6.8 | )

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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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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