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Property, Plant And Equipment (Schedule Of Property, Plant And Equipment) (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property Plant and Equipment $ 22,819.5 $ 21,649.9
Accumulated Depreciation and Amortization (7,277.0) (7,290.4)
Net Property, Plant and Equipment 15,542.5 14,359.5
Gas Distribution Utility    
Property, Plant and Equipment [Line Items]    
Property Plant and Equipment [1] 13,776.0 12,531.0
Accumulated Depreciation and Amortization [1] (3,373.8) (3,227.8)
Electric Utility    
Property, Plant and Equipment [Line Items]    
Property Plant and Equipment [1],[2] 8,374.2 7,403.8
Accumulated Depreciation and Amortization [1],[2] (3,809.5) (3,673.2)
Common Utility    
Property, Plant and Equipment [Line Items]    
Property Plant and Equipment 155.8 141.3
Accumulated Depreciation and Amortization (74.6) (52.6)
Construction Work In Process    
Property, Plant and Equipment [Line Items]    
Property Plant and Equipment 474.8 950.5
Non-Utility And Other    
Property, Plant and Equipment [Line Items]    
Property Plant and Equipment [2] 38.7 623.3
Accumulated Depreciation and Amortization [2] $ (19.1) $ (336.8)
[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.