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Property, Plant, and Equipment - Balances (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Property, plant, and equipment |  |
Accumulated depreciation | $ 8,515.9 | $ 8,618.5
Net property, plant, and equipment | 22,000.9 | 21,347.0
Utility operations |  |
Property, plant, and equipment |  |
Accumulated depreciation | 7,573.6 | 7,021.8
Net | 17,961.8 | 17,555.5
CWIP | 707.5 | 508.2
Net property, plant, and equipment | 18,669.3 | 18,063.7
Utility operations | Electric - generation |  |
Property, plant, and equipment |  |
Property, plant, and equipment | 6,410.6 | 6,071.8
Utility operations | Electric - distribution |  |
Property, plant, and equipment |  |
Property, plant, and equipment | 6,534.6 | 6,137.5
Utility operations | Natural gas - distribution, storage, and transmission |  |
Property, plant, and equipment |  |
Property, plant, and equipment | 10,766.3 | 10,055.9
Utility operations | Property, plant, and equipment to be retired, net |  |
Property, plant, and equipment |  |
Property, plant, and equipment to be retired, net | 174.8 | 930.6
Utility operations | Other |  |
Property, plant, and equipment |  |
Property, plant, and equipment | 1,649.1 | 1,381.5
Non-utility operations |  |
Property, plant, and equipment |  |
Accumulated depreciation | 731.5 | 671.3
Net | 3,249.1 | 3,125.9
CWIP | 82.5 | 157.4
Net property, plant, and equipment | 3,331.6 | 3,283.3
Non-utility operations | Other |  |
Property, plant, and equipment |  |
Property, plant, and equipment | 127.1 | 166.9
Non-utility operations | We Power generation |  |
Property, plant, and equipment |  |
Property, plant, and equipment | 3,244.4 | 3,215.9
Non-utility operations | Renewable generation |  |
Property, plant, and equipment |  |
Property, plant, and equipment | 193.3 | 0.0
Non-utility operations | Natural gas storage |  |
Property, plant, and equipment |  |
Property, plant, and equipment | 244.8 | 244.8
Non-utility operations | Corporate services |  |
Property, plant, and equipment |  |
Property, plant, and equipment | 171.0 | 169.6
Non-Utility Energy Infrastructure | Non-utility operations |  |
Property, plant, and equipment |  |
Property, plant, and equipment | $ 3,682.5 | $ 3,460.7

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- Definition Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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