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Property, Plant And Equipment | 12 Months Ended
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Dec. 31, 2020
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) | 2020 |  | 2019
Property, Plant and Equipment |  |  |
Gas Distribution Utility(1) | $ | 14,010.2 |  |  | $ | 14,989.7 |
Electric Utility(1) | 6,478.0 |  |  | 8,902.3 |
Corporate | 197.3 |  |  | 153.3 |
Construction Work in Process | 572.6 |  |  | 457.3 |
Renewable Generation Assets(2) | 175.7 |  |  | — |
Non-Utility and Other(3) | 2,746.1 |  |  | 39.3 |
Total Property, Plant and Equipment | $ | 24,179.9 |  |  | $ | 24,541.9 |
Accumulated Depreciation and Amortization |  |  |
Gas Distribution Utility(1) | $ | (3,292.9) |  |  | $ | (3,556.0) |
Electric Utility(1) | (2,305.0) |  |  | (3,973.8) |
Corporate | (109.3) |  |  | (79.5) |
Renewable Generation Assets(2) | (0.1) |  |  | — |
Non-Utility and Other(3) | (1,853.1) |  |  | (20.4) |
Total Accumulated Depreciation and Amortization | $ | (7,560.4) |  |  | $ | (7,629.7) |
Net Property, Plant and Equipment | $ | 16,619.5 |  |  | $ | 16,912.2 |
(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)Our renewable generation assets are part of our electric segment and represent Non-Utility Property, owned and operated by Rosewater Wind Generation LLC, a joint venture between NIPSCO and unrelated tax equity partner, and depreciated straight-line over 30 years. Refer to Note 4, "Variable Interest Entities" for additional information. (3)Non-Utility and Other as of December 31, 2020 includes net book value of $903.8 million related to R.M. Schahfer Generating Station, which was reclassified from Electric Utility in the second quarter of 2020. Depreciation expense for the remaining net book value continues to be recorded at the composite depreciation rate approved by the IURC. See Note 20-E, "Other 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, 2020, 2019 and 2018 were as follows:
| 2020 |  | 2019 |  | 2018
Electric Operations(1) | 3.4 | % |  | 2.8 | % |  | 2.9 | %
Gas Distribution Operations | 2.3 | % |  | 2.5 | % |  | 2.2 | %
(1)Increased rate beginning in 2020 primarily attributable to higher depreciation rates from the recent rate case proceeding. We recognized depreciation expense of $655.6 million, $612.2 million and $503.4 million for the years ended 2020, 2019 and 2018, respectively. Amortization of Software Costs. We amortized $56.7 million, $55.5 million and $54.1 million in 2020, 2019 and 2018, respectively, related to software costs. Our unamortized software balance was $136.4 million and $169.6 million at December 31, 2020 and 2019, respectively. Amortization of Cloud Computing Costs. We amortized $3.4 million, $1.6 million and $0.1 million in 2020, 2019 and 2018, respectively, related to cloud computing costs. Our unamortized cloud computing balance was $12.7 million and $14.2 million at December 31, 2020 and 2019, respectively.

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- Definition The entire disclosure for long-lived, physical asset used in normal conduct of business and not intended for resale. Includes, but is not limited to, work of art, historical treasure, and similar asset classified as collections. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99893-112916 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -URI http://asc.fasb.org/topic&trid=2155823 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=120429125&loc=SL120174063-112916 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 360 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120429125&loc=d3e99779-112916 + Details
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