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Basis of Presentation (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
item
Jun. 30, 2012
Cash and Cash Equivalents        
Number of banks in which the entity has its majority cash balances held in demand deposit accounts     1  
Supplemental Non-Cash Investing and Financing Activities        
Accounts payable     $ 4.4 $ 3.0
Taxes Collected from Customers        
Excise taxes and Hawaii Public Utility Commission fees $ 1.8 $ 1.8 $ 3.7 $ 3.7