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Long-Term Debt	9 Months Ended
Long-Term Debt	Sep. 30, 2019
Long-term Debt, Current and Noncurrent [Abstract]
Long-term Debt	Long-Term Debt On April 1, 2019, NIPSCO repaid $41.0 million of 5.85% pollution control bonds at maturity. On August 12, 2019, we closed our placement of $750.0 million of 2.95% senior unsecured notes maturing in 2029 which resulted in approximately $742.4 million of net proceeds after deducting commissions and expenses.