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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, 2011 $ 191.7utl_CommonStockEquity $ 162.3utl_CommonStockEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 29.4utl_CommonStockEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Net Income 18.2us-gaap_NetIncomeLoss   18.2us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Dividends (17.2)us-gaap_Dividends   (17.2)us-gaap_Dividends
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Shares Issued Under Stock Plans 0.9us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation 0.9us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Issuance of Common Shares 1.1us-gaap_StockIssuedDuringPeriodValueNewIssues 1.1us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Issuance of Common Shares 65.7utl_CommonStockIssuedDuringPeriodPublicOfferingValue 65.7utl_CommonStockIssuedDuringPeriodPublicOfferingValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Ending Balance at Dec. 31, 2012 260.4utl_CommonStockEquity 230.0utl_CommonStockEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
30.4utl_CommonStockEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Net Income 21.6us-gaap_NetIncomeLoss   21.6us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Dividends (19.1)us-gaap_Dividends   (19.1)us-gaap_Dividends
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Shares Issued Under Stock Plans 1.0us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation 1.0us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Issuance of Common Shares 1.1us-gaap_StockIssuedDuringPeriodValueNewIssues 1.1us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Ending 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 24.7us-gaap_NetIncomeLoss   24.7us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Dividends (19.2)us-gaap_Dividends   (19.2)us-gaap_Dividends
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
Shares Issued Under Stock Plans 1.4us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation 1.4us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Issuance of Common Shares 1.2us-gaap_StockIssuedDuringPeriodValueNewIssues 1.2us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
 
Ending 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