v3.8.0.1

Property, Plant and Equipment (Tables) | 12 Months Ended
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Dec. 31, 2017
Property, Plant and Equipment [Abstract] |
Classes of Property, Plant and Equipment | The provision for depreciation has been computed principally by the straight-line method based on the estimated useful lives of the depreciable assets as follows:
Category |  | Useful Life
Buildings |  | 30 years
Leased assets and leasehold improvements |  | Amortized over the lesser of the economic life of the asset or the term of the lease
Machinery and equipment |  | 3 – 10 years
The classes of property, plant and equipment as of December 31 are summarized as follows ($ in millions):
| 2017 |  | 2016
Land and improvements | $ | 67.8 |  |  | $ | 63.5 |
Buildings and leasehold improvements | 389.7 |  |  | 340.8 |
Machinery and equipment | 1,341.8 |  |  | 1,147.5 |
Gross property, plant and equipment | 1,799.3 |  |  | 1,551.8 |
Less: accumulated depreciation | (1,086.8 | ) |  | (1,004.2 | )
Property, plant and equipment, net | $ | 712.5 |  |  | $ | 547.6 |

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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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