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Statements of Consolidated Comprehensive Income - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Net Income (Loss) $ 27.2 $ (4.9) $ 242.7 $ 242.7
Other comprehensive income (loss):        
Net unrealized gain (loss) on available-for-sale securities [1] (0.3) 0.3 2.2 0.0
Net unrealized gain (loss) on cash flow hedges [2] (22.6) 0.2 (146.8) 1.8
Unrecognized pension and OPEB benefit [3] 0.2 (0.2) 0.7 2.7
Total other comprehensive income (loss) (22.7) 0.3 (143.9) 4.5
Comprehensive Income (Loss) 4.5 (4.6) 98.8 247.2
Less: Comprehensive income attributable to noncontrolling interest 0.0 0.0 0.0 15.6
Comprehensive Income (Loss) attributable to NiSource $ 4.5 $ (4.6) $ 98.8 $ 231.6
[1] Net unrealized gain (loss) on available-for-sale securities, net of $0.1 million tax benefit and $0.2 million tax expense in the third quarter of 2016 and 2015, respectively, and $1.2 million and zero tax expense for the nine months ended 2016 and 2015, respectively.
[2] Net unrealized gain (loss) on derivatives qualifying as cash flow hedges, net of $14.0 million tax benefit and $0.2 million tax expense in the third quarter of 2016 and 2015, respectively, and $90.6 million tax benefit and $1.1 million tax expense for the nine months ended 2016 and 2015, respectively.
[3] Unrecognized pension and OPEB benefit (cost), net of $0.1 million tax expense and $0.1 million tax benefit in the third quarter of 2016 and 2015, respectively, and $0.4 million and $2.1 million tax expense for the nine months ended 2016 and 2015, respectively.