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Property, Plant And Equipment | 12 Months Ended
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Dec. 31, 2018
Property, Plant and Equipment [Abstract] |
Property, Plant And Equipment | Property, Plant and Equipment Our property, plant and equipment on the Consolidated Balance Sheets are classified as follows:
At December 31, (in millions) | 2018 |  | 2017
Property, Plant and Equipment |  |  |
Gas Distribution Utility(1) | $ | 13,776.0 |  |  | $ | 12,531.0 |
Electric Utility(1) | 8,374.2 |  |  | 7,403.8 |
Corporate | 155.8 |  |  | 141.3 |
Construction Work in Process | 474.8 |  |  | 950.5 |
Non-Utility and Other(2) | 38.7 |  |  | 623.3 |
Total Property, Plant and Equipment | $ | 22,819.5 |  |  | $ | 21,649.9 |
Accumulated Depreciation and Amortization |  |  |
Gas Distribution Utility(1) | $ | (3,373.8 | ) |  | $ | (3,227.8 | )
Electric Utility(1) | (3,809.5 | ) |  | (3,673.2 | )
Corporate | (74.6 | ) |  | (52.6 | )
Non-Utility and Other(2) | (19.1 | ) |  | (336.8 | )
Total Accumulated Depreciation and Amortization | $ | (7,277.0 | ) |  | $ | (7,290.4 | )
Net Property, Plant and Equipment | $ | 15,542.5 |  |  | $ | 14,359.5 |
(1)NIPSCO’s common utility plant and associated accumulated depreciation and amortization are allocated between Gas Distribution Utility and Electric Utility Property, Plant and Equipment. (2)Non-Utility and Other as of December 31, 2017 includes net book value of $247.8 million related to Bailly Generating Station (Units 7 and 8) which was reclassified from Electric Utility in the fourth quarter of 2016. In May 2018, Units 7 and 8 were retired from service and the remaining balance was reclassified to "Regulatory assets (noncurrent)" on the Consolidated Balance Sheets. See Note 18-E, "Other Matters," and Note 8, "Regulatory Matters," for additional information. The weighted average depreciation provisions for utility plant, as a percentage of the original cost, for the periods ended December 31, 2018, 2017 and 2016 were as follows:
| 2018 |  | 2017 |  | 2016
Electric Operations(1) | 2.9 | % |  | 3.4 | % |  | 3.3 | %
Gas Distribution Operations | 2.2 | % |  | 2.1 | % |  | 2.1 | %
(1)Lower depreciation rate in 2018 due to reduced EERM-related depreciation expense and higher depreciable base from transmission assets being placed into service in 2018. We recognized depreciation expense of $503.4 million, $501.5 million and $475.1 million for the years ended 2018, 2017 and 2016, respectively. Amortization of Software Costs. We amortized $54.1 million in 2018, $44.0 million in 2017 and $41.4 million in 2016 related to software costs. Our unamortized software balance was $159.5 million and $189.0 million at December 31, 2018 and 2017, 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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