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Property, Plant, and Equipment | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Abstract] |  |
Property, Plant, and Equipment | 6. Property, Plant, and Equipment Property, plant, and equipment consisted of the following:
|  | September 30, 2018 |  |  | December 31, 2017 |
Land |  | $ | 7.5 |  |  | $ | 7.5 |
Software |  |  | 218.5 |  |  |  | 197.4 |
Machinery and equipment |  |  | 118.8 |  |  |  | 120.3 |
Buildings and improvements |  |  | 39.8 |  |  |  | 36.3 |
Total property, plant, and equipment |  |  | 384.6 |  |  |  | 361.5 |
Accumulated depreciation |  |  | (284.0 | ) |  |  | (259.5 | )
Property, plant, and equipment, net |  | $ | 100.6 |  |  | $ | 102.0 |
Depreciation expense of property, plant, and equipment totaled $28.4 and $25.8 for the nine months ended September 30, 2018, and 2017, respectively. | 8. Property, Plant, and Equipment Property, plant, and equipment consist of the following:
|  | December 31, |
|  | 2017 |  |  | 2016 |
Land |  | $ | 7.5 |  |  | $ | 7.5 |
Software |  |  | 197.4 |  |  |  | 162.1 |
Machinery and equipment |  |  | 120.3 |  |  |  | 102.4 |
Buildings and improvements |  |  | 36.3 |  |  |  | 36.0 |
Total property, plant and equipment |  |  | 361.5 |  |  |  | 308.0 |
Accumulated depreciation |  |  | (259.5 | ) |  |  | (223.5 | )
Property, plant and equipment, net |  | $ | 102.0 |  |  | $ | 84.5 |
Depreciation expense of property, plant, and equipment totaled $35.3, $34.8, and $33.5 for the years ended December 31, 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 + Details
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