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Operations and Significant Accounting Policies (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2011 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Customer Information [Line Items] |  |  |  |  |  |
Escrow Deposit |  | $ 5.4 |  |  |  |
Non-Controlling Interest in Subsidiaries [Abstract] |  |  |  |  |  |
Purchase of Non-Controlling Interest at Book Value | 8.8 |  |  |  |  |
Purchase of Non-Controlling Interest, Shares Issued | 200 |  |  |  |  |
Trade Accounts Receivable [Abstract] |  |  |  |  |  |
Billed |  | 78.7 |  | 70.4 |  |
Unbilled |  | 18.7 |  | 17.4 |  |
Less: Allowance for Doubtful Accounts |  | 1.1 |  | 1.0 |  |
Total Trade Accounts Receivable |  | 96.3 |  | 86.8 |  |
Income Taxes Receivable |  | 0 |  | 2.2 |  |
Total Accounts Receivable - Net |  | 96.3 |  | 89.0 |  |
Inventories [Abstract] |  |  |  |  |  |
Fuel |  | 13.1 | [1] | 28.0 | [1] |
Materials and Supplies |  | 46.2 |  | 41.8 |  |
Total Inventories |  | 59.3 |  | 69.8 |  |
Impairement of Long-Lived Assets [Abstract] |  |  |  |  |  |
Land Impairment |  | 0 |  | 0 |  | 1.7
Prepayments and Other Current Assets [Abstract] |  |  |  |  |  |
Deferred Fuel Adjustment Clause |  | 23.0 |  | 22.5 |  |
Other |  | 12.1 |  | 11.1 |  |
Total Prepayments and Other Current Assets |  | 35.1 |  | 33.6 |  |
Other Current Liabilities [Abstract] |  |  |  |  |  |
Customer Deposits |  | 26.0 |  | 28.8 |  |
Other |  | 26.6 |  | 33.8 |  |
Total Other Current Liabilities |  | 52.6 |  | 62.6 |  |
Other Non-Current Liabilities [Abstract] |  |  |  |  |  |
Asset Retirement Obligation |  | 81.8 |  | 77.9 |  | 57.0
Other |  | 45.4 |  | 45.4 |  |
Total Other Non-Current Liabilities |  | $ 127.2 |  | $ 123.3 |  |
Income Tax Disclosure [Abstract] |  |  |  |  |  |
More Likely Than Not Definition |  | 50.00% |  |  |  |
Municipal Customers [Member] |  |  |  |  |  |
Customer Information [Line Items] |  |  |  |  |  |
Number of Customers |  | 16 |  |  |  |
Non-Affiliated Private Utility [Member] |  |  |  |  |  |
Customer Information [Line Items] |  |  |  |  |  |
Number of Customers |  | 1 |  |  |  |
Retail Customers [Member] |  |  |  |  |  |
Customer Information [Line Items] |  |  |  |  |  |
Number of Customers |  | 143,000 |  |  |  |
Electric [Member] |  |  |  |  |  |
Customer Information [Line Items] |  |  |  |  |  |
Number of Customers |  | 15,000 |  |  |  |
Natural Gas [Member] |  |  |  |  |  |
Customer Information [Line Items] |  |  |  |  |  |
Number of Customers |  | 12,000 |  |  |  |
Water [Member] |  |  |  |  |  |
Customer Information [Line Items] |  |  |  |  |  |
Number of Customers |  | 10,000 |  |  |  |
[1] | Fuel inventory was lower in 2013 primarily due to higher than expected thermal generation and the timing of coal shipments.

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