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Condensed Parent Company Financial Statements (Condensed Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
--- | --- | --- | --- | ---
Current assets: |  |  |  |
Other | $ 84.9 | $ 89.4 |  |
Total current assets | 1,011.2 | 994.3 |  |
Investments: |  |  |  |
Other | 57.5 | 62.0 |  |
Total investments | 329.6 | 319.0 |  |
Other assets | 1,445.1 | 1,634.2 |  |
Total assets | 11,112.4 | 10,785.5 | 9,687.9 |
Capitalization: |  |  |  |
Retained earnings | 1,780.7 | 1,630.7 |  |
Accumulated other comprehensive loss | (0.2) | (0.8) |  |
Shares in deferred compensation trust | (8.0) | (7.3) |  |
Total common equity | 3,281.4 | 3,134.9 | 3,013.0 | 2,893.6
Long-term debt, net | 2,977.8 | 3,136.6 |  |
Total capitalization | 6,461.0 | 6,478.4 |  |
Current liabilities: |  |  |  |
Current maturities of long-term debt | 358.5 | 1.5 |  |
Commercial paper | 279.4 | 217.5 |  |
Other | 133.1 | 176.0 |  |
Total current liabilities | 1,433.3 | 1,020.0 |  |
Other long-term liabilities and deferred credits: |  |  |  |
Non-current deferred tax liabilities | 2,112.7 | 1,934.2 |  |
Other | 273.9 | 262.5 |  |
Total long-term liabilities and deferred credits | 3,218.1 | 3,287.1 |  |
Total capitalization and liabilities | 11,112.4 | 10,785.5 |  |
Parent Company [Member] |  |  |  |
Current assets: |  |  |  |
Notes receivable from affiliated companies | 72 | 77 |  |
Other | 3.0 | 2.0 |  |
Total current assets | 75.0 | 79.0 |  |
Investments: |  |  |  |
Investments in consolidated subsidiaries | 3,585 | 3,447 |  |
Other | 14.0 | 20.0 |  |
Total investments | 3,599.0 | 3,467.0 |  |
Other assets | 6.0 | 5.0 |  |
Total assets | 3,680.0 | 3,551.0 |  |
Capitalization: |  |  |  |
Common stock and additional paid-in capital | 1,509 | 1,512 |  |
Retained earnings | 1,777.0 | 1,627.0 |  |
Accumulated other comprehensive loss | 0 | (1.0) |  |
Shares in deferred compensation trust | (8.0) | (7.0) |  |
Total common equity | 3,278.0 | 3,131.0 |  |
Long-term debt, net | 0 | 250.0 |  |
Total capitalization | 3,278.0 | 3,381.0 |  |
Current liabilities: |  |  |  |
Current maturities of long-term debt | 250.0 | 0 |  |
Commercial paper | 96.0 | 105.0 |  |
Other | 10.0 | 21.0 |  |
Total current liabilities | 356.0 | 126.0 |  |
Other long-term liabilities and deferred credits: |  |  |  |
Non-current deferred tax liabilities | 39.0 | 38.0 |  |
Other | 7.0 | 6.0 |  |
Total long-term liabilities and deferred credits | 46.0 | 44.0 |  |
Total capitalization and liabilities | $ 3,680.0 | $ 3,551.0 |  |

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