Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2016

Long-term Debt, Current and Noncurrent [Abstract]

Schedule of Long-Term Debt

NiSource long-term debt as of December 31, 2016 and 2015 is as follows:

Long-term debt type	Maturity	Weighted average interest rate (%)			Outstanding balance as of December 31, (in millions)
					2016			2015
Senior notes:
NiSource Finance	March 2016	10.75	%		$	—		$	201.5
NiSource Finance	November 2016	5.41	%		—			90.0
NiSource Finance	September 2017	5.25	%		210.4			210.4
NiSource Finance	March 2018	6.40	%		476.0			476.0
NiSource Finance	January 2019	6.80	%		500.0			500.0
NiSource Finance	March 2019	Variable		(1)	500.0			—
NiSource Finance	September 2020	5.45	%		550.0			550.0
NiSource Finance	December 2021	4.45	%		63.6			63.6
NiSource Finance	March 2022	6.13	%		500.0			500.0
NiSource Finance	February 2023	3.85	%		250.0			250.0
NiSource Finance	November 2025	5.89	%		265.0			265.0
NiSource Finance	December 2040	6.25	%		250.0			250.0
NiSource Finance	June 2041	5.95	%		400.0			400.0
NiSource Finance	February 2042	5.80	%		250.0			250.0
NiSource Finance	February 2043	5.25	%		500.0			500.0
NiSource Finance	February 2044	4.80	%		750.0			750.0
NiSource Finance	February 2045	5.65	%		500.0			500.0
Capital Markets	December 2027	6.78	%		3.0			3.0
Total senior notes					$	5,968.0		$	5,759.5
Medium term notes:
Columbia of Massachusetts	December 2025 to February 2028	6.30	%		$	40.0		$	40.0
Capital Markets	March 2017 to May 2027	7.92	%		106.0			106.0
NIPSCO	June 2017 to August 2027	7.57	%		95.5			95.5
Total medium term notes					$	241.5		$	241.5
Capital leases:
NiSource Corporate Services	October 2019 to April 2021	2.92	%		$	3.5		$	3.7
NIPSCO	May 2018	3.95	%		12.7			52.8
Columbia of Ohio	October 2021 to June 2038	6.53	%		80.1			79.8
Columbia of Massachusetts	December 2033 to July 2036	5.33	%		23.7			24.1
Columbia of Virginia	August 2024 to July 2029	12.27	%		5.5			5.8
Columbia of Pennsylvania	August 2027 to June 2036	5.45	%		31.9			32.4
Total capital leases					157.4			198.6
Pollution control bonds - NIPSCO	July 2017 to April 2019	5.76	%		96.0			226.0
Notes payable - NiSource Development Company	July 2041	5.56	%		—			2.1
Unamortized issuance costs and discounts					(41.6		)	$	(45.5	)
Total Long-Term Debt					6,421.3			$	6,382.2

⁽¹⁾Rate of one month Libor plus 95 basis points.