Borrowing Arrangements (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Long term senior unsecured obligations and first mortgage bonds outstanding by subsidiary

Long-term senior unsecured obligations and first mortgage bonds outstanding by subsidiary follow:

	At December 31,
(In millions)	2017		2016
Utility Holdings
Fixed Rate Senior Unsecured Notes
2018, 5.75%	$	100.0	$	100.0
2020, 6.28%	100.0		100.0
2021, 4.67%	55.0		55.0
2023, 3.72%	150.0		150.0
2026, 5.02%	60.0		60.0
2028, 3.20%	45.0		45.0
2032, 3.26%	100.0		—
2035, 6.10%	75.0		75.0
2035, 3.90%	25.0		25.0
2041, 5.99%	35.0		35.0
2042, 5.00%	100.0		100.0
2043, 4.25%	80.0		80.0
2045, 4.36%	135.0		135.0
2047, 3.93%	100.0		—
2055, 4.51%	40.0		40.0
Total Utility Holdings	1,200.0		1,000.0
Indiana Gas
Fixed Rate Senior Unsecured Notes
2025, Series E, 6.53%	10.0		10.0
2027, Series E, 6.42%	5.0		5.0
2027, Series E, 6.68%	1.0		1.0
2027, Series F, 6.34%	20.0		20.0
2028, Series F, 6.36%	10.0		10.0
2028, Series F, 6.55%	20.0		20.0
2029, Series G, 7.08%	30.0		30.0
Total Indiana Gas	96.0		96.0
SIGECO
First Mortgage Bonds
2022, 2013 Series C, current adjustable rate 1.565%, tax-exempt	4.6		4.6
2024, 2013 Series D, current adjustable rate 1.565%, tax-exempt	22.5		22.5
2025, 2014 Series B, current adjustable rate 1.565%, tax-exempt	41.3		41.3
2029, 1999 Series, 6.72%	80.0		80.0
2037, 2013 Series E, current adjustable rate 1.565%, tax-exempt	22.0		22.0
2038, 2013 Series A, 4.00%, tax-exempt	22.2		22.2
2043, 2013 Series B, 4.05%, tax-exempt	39.6		39.6
2044, 2014 Series A, 4.00% tax-exempt	22.3		22.3
2055, 2015 Series Mt. Vernon, 2.375%, tax-exempt	23.0		23.0
2055, 2015 Series Warrick County, 2.375%, tax-exempt	15.2		15.2
Total SIGECO	292.7		292.7

	At December 31,
(In millions)	2017			2016
Vectren Capital Corp.
Fixed Rate Senior Unsecured Notes
2017, 3.48%	—			75.0
2019, 7.30%	60.0			60.0
2022, 3.33%	75.0			75.0
2025, 4.53%	50.0			50.0
2030, 3.90%	75.0			75.0
Total Vectren Capital Corp.	260.0			335.0
Total long-term debt outstanding	1,848.7			1,723.7
Current maturities of long-term debt	(100.0		)	(124.1		)
Debt issuance costs	(9.4		)	(9.0		)
Unamortized debt premium & discount-net	(0.6		)	(0.7		)
Total long-term debt-net	$	1,738.7		$	1,589.9

Short term borrowing arrangements

Following is certain information regarding these short-term borrowing arrangements:

	Utility Group Borrowings									Nonutility Group Borrowings
(In millions)	2017			2016			2015			2017			2016			2015
As of Year End
Balance Outstanding	$	179.5		$	194.4		$	14.5		$	70.0		$	—		$	—
Weighted Average Interest Rate	1.92		%	1.05		%	0.55		%	2.68		%	N/A			N/A
Annual Average
Balance Outstanding	$	172.4		$	59.8		$	53.8		$	12.2		$	0.2		$	24.8
Weighted Average Interest Rate	1.30		%	0.71		%	0.38		%	2.44		%	1.60		%	1.33		%
Maximum Month End Balance Outstanding	$	238.7		$	194.4		$	121.5		$	70.0		$	6.3		$	69.1