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Regulatory Matters - Regulatory Assets and Liabilities (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Regulatory Assets and Liabilities [Line Items]    
Current Regulatory Asset $ 23.0 $ 22.5
Non-Current Regulatory Asset 263.8 340.3
Total Regulatory Assets 286.8 362.8
Non-Current Regulatory Liability 81.0 60.1
Income Taxes [Member]
    
Regulatory Assets and Liabilities [Line Items]    
Non-Current Regulatory Liability 17.0 19.5
Plant Removal Obligations [Member]
    
Regulatory Assets and Liabilities [Line Items]    
Non-Current Regulatory Liability 19.7 18.1
Wholesale and Retail Contra AFUDC [Member]
    
Regulatory Assets and Liabilities [Line Items]    
Non-Current Regulatory Liability 19.7 15.5
Defined Benefit Pension and Other Postretirement Plans [Member]
    
Regulatory Assets and Liabilities [Line Items]    
Non-Current Regulatory Liability 16.3 [1] 0 [1]
Other [Member]
    
Regulatory Assets and Liabilities [Line Items]    
Non-Current Regulatory Liability 8.3 7.0
Deferred Fuel [Member]
    
Regulatory Assets and Liabilities [Line Items]    
Current Regulatory Asset 23.0 [2] 22.5 [2]
Defined Benefit Pension and Other Postretirement Plans [Member]
    
Regulatory Assets and Liabilities [Line Items]    
Non-Current Regulatory Asset 164.1 [1] 260.7 [1]
Income Taxes [Member]
    
Regulatory Assets and Liabilities [Line Items]    
Non-Current Regulatory Asset 35.3 36.0
Asset Retirement Obligation [Member]
    
Regulatory Assets and Liabilities [Line Items]    
Non-Current Regulatory Asset 16.0 12.1
Cost Recovery Riders [Member]
    
Regulatory Assets and Liabilities [Line Items]    
Non-Current Regulatory Asset 39.6 [3] 18.5 [3]
PPACA Income Tax Deferral [Member]
    
Regulatory Assets and Liabilities [Line Items]    
Non-Current Regulatory Asset 5.0 5.0
Conservation Improvement Program [Member]
    
Regulatory Assets and Liabilities [Line Items]    
Non-Current Regulatory Asset 0 4.3
Other [Member]
    
Regulatory Assets and Liabilities [Line Items]    
Non-Current Regulatory Asset $ 3.8 $ 3.7
[1] Defined benefit pension and other postretirement items included in our Regulated Operations, which are otherwise required to be recognized in accumulated other comprehensive income, are recognized as regulatory assets or regulatory liabilities on our Consolidated Balance Sheet (See Note 17. Pension and Other Postretirement Benefit Plans).
[2] Current regulatory assets are included in Prepayments and Other on the Consolidated Balance Sheet.
[3] The cost recovery rider regulatory asset is primarily due to capital expenditures related to our Bison Wind Energy Center and is recognized in accordance with the accounting standards for alternative revenue programs.