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Income Tax Expense - Deferred Tax Assets and Liabilities (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
Deferred Tax Assets [Abstract] |  |  |  |
Employee Benefits and Compensation | $ 120.2 |  | $ 132.7 |
Property Related | 59.8 |  | 56.4 |
NOL Carryforwards | 90.8 |  | 61.7 |
Tax Credit Carryforwards | 28.3 |  | 12.2 |
Other | 24.6 |  | 20.4 |
Gross Deferred Tax Assets | 323.7 |  | 283.4 |
Deferred Tax Asset Valuation Allowance | (2.4) |  | (0.4) |
Total Deferred Tax Assets | 321.3 |  | 283.0 |
Deferred Tax Liabilities [Abstract] |  |  |  |
Property Related | 577.1 |  | 482.7 |
Regulatory Asset for Benefit Obligations | 104.3 |  | 117.9 |
Unamortized Investment Tax Credits | 11.9 |  | 12.8 |
Partnership Basis Differences | 28.6 |  | 24.4 |
Other | 30.1 |  | 24.0 |
Total Deferred Tax Liabilities | 752.0 |  | 661.8 |
Net Deferred Income Taxes | 430.7 |  | 378.8 |
Net Current Deferred Tax Liabilities | 6.9 | [1] | 5.2 | [1]
Net Long-Term Deferred Tax Liabilities | $ 423.8 |  | $ 373.6 |
[1] | Included in Other Current Liabilities.

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