XML 44 R25.htm IDEA: XBRL DOCUMENT v3.3.1.900

Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2015

Environmental Obligations

The following table sets forth a summary of changes in the Company’s liability for Environmental Obligations for the years ended December 31, 2015 and 2014.

Environmental Obligations

		(millions)
		Fitchburg								Northern Utilities								Total
		2015				2014				2015				2014				2015				2014
Total Balance at Beginning of Period		$	1.9			$	12.0			$	3.6			$	2.8			$	5.5			$	14.8
Additions			—				—				2.9				1.3				2.9				1.3
Less: Payments / Reductions			0.7				10.1				4.9				0.5				5.6				10.6
Total Balance at End of Period		$	1.2			$	1.9			$	1.6			$	3.6			$	2.8			$	5.5
Less: Current Portion			0.2				1.9				1.1				1.6				1.3				3.5
Noncurrent Balance at December 31, 2014		$	1.0			$	—			$	0.5			$	2.0			$	1.5			$	2.0

X

- Definition

Schedule Of Environmental Remediation Obligations Table [Text Block]

+ References

No definition available.

+ Details

Name:	utl_ScheduleOfEnvironmentalRemediationObligationsTableTextBlock
Namespace Prefix:	utl_
Data Type:	nonnum:textBlockItemType
Balance Type:	na
Period Type:	duration