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Consolidated Statements of Changes in Common Stock Equity (USD $)
In Millions
Total
Common Equity
Retained Earnings
Beginning Balance at Dec. 31, 2013 $ 265.0utl_CommonStockEquity $ 232.1utl_CommonStockEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 32.9utl_CommonStockEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Net Income 12.6us-gaap_NetIncomeLoss   12.6us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Dividends on Common Shares (4.8)us-gaap_Dividends   (4.8)us-gaap_Dividends
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Stock Compensation Plans 0.7us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation 0.7us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Issuance of Common Shares 0.3us-gaap_StockIssuedDuringPeriodValueNewIssues 0.3us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Ending Balance at Mar. 31, 2014 273.8utl_CommonStockEquity 233.1utl_CommonStockEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
40.7utl_CommonStockEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Beginning Balance at Dec. 31, 2014 273.1utl_CommonStockEquity 234.7utl_CommonStockEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
38.4utl_CommonStockEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Net Income 13.6us-gaap_NetIncomeLoss   13.6us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Dividends on Common Shares (4.9)us-gaap_Dividends   (4.9)us-gaap_Dividends
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Stock Compensation Plans 1.0us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation 1.0us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Issuance of Common Shares 0.3us-gaap_StockIssuedDuringPeriodValueNewIssues 0.3us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Ending Balance at Mar. 31, 2015 $ 283.1utl_CommonStockEquity $ 236.0utl_CommonStockEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 47.1utl_CommonStockEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember