v2.4.0.6

Condensed Parent Company Financial Statements (Condensed Balance Sheet) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
--- | --- | --- | --- | ---
Current assets: |  |  |  |
Income tax refunds receivable | $ 18.2 | $ 39.1 |  |
Other | 43.3 | 37.7 |  |
Total current assets | 994.3 | 870.6 |  |
Investments: |  |  |  |
Other | 62.0 | 61.9 |  |
Total investments | 319.0 | 300.7 |  |
Other assets | 1,634.2 | 1,483.3 |  |
Total assets | 10,785.5 | 9,687.9 | 9,282.9 |
Capitalization: |  |  |  |
Retained earnings | 1,630.7 | 1,510.2 |  |
Accumulated other comprehensive loss | (0.8) | (0.8) |  |
Shares in deferred compensation trust | (7.3) | (8.3) |  |
Total common equity | 3,134.9 | 3,013.0 | 2,893.6 | 2,772.6
Long-term debt, net | 3,136.6 | 2,703.1 |  |
Total capitalization | 6,478.4 | 5,923.0 |  |
Current liabilities: |  |  |  |
Commercial paper | 217.5 | 102.8 |  |
Other | 113.5 | 107.0 |  |
Total current liabilities | 1,020.0 | 855.2 |  |
Other Liabilities And Deferred Credits Noncurrent [Abstract] |  |  |  |
Deferred income taxes | 1,934.2 | 1,592.2 |  |
Other | 262.5 | 259.4 |  |
Total long-term liabilities and deferred credits | 3,287.1 | 2,909.7 |  |
Total capitalization and liabilities | 10,785.5 | 9,687.9 |  |
Parent Company [Member] |  |  |  |
Current assets: |  |  |  |
Notes receivable from affiliated companies | 77 | 211 |  |
Income tax refunds receivable | 0 | 11.0 |  |
Other | 2.0 | 5.0 |  |
Total current assets | 79.0 | 227.0 |  |
Investments: |  |  |  |
Investments in consolidated subsidiaries | 3,447 | 3,129 |  |
Other | 20.0 | 20.0 |  |
Total investments | 3,467.0 | 3,149.0 |  |
Other assets | 5.0 | 6.0 |  |
Total assets | 3,551.0 | 3,382.0 |  |
Capitalization: |  |  |  |
Common stock and additional paid-in capital | 1,512 | 1,512 |  |
Retained earnings | 1,627.0 | 1,506.0 |  |
Accumulated other comprehensive loss | (1.0) | (1.0) |  |
Shares in deferred compensation trust | (7.0) | (8.0) |  |
Total common equity | 3,131.0 | 3,009.0 |  |
Long-term debt, net | 250.0 | 250.0 |  |
Total capitalization | 3,381.0 | 3,259.0 |  |
Current liabilities: |  |  |  |
Commercial paper | 105.0 | 70.0 |  |
Other | 21.0 | 14.0 |  |
Total current liabilities | 126.0 | 84.0 |  |
Other Liabilities And Deferred Credits Noncurrent [Abstract] |  |  |  |
Deferred income taxes | 38.0 | 32.0 |  |
Other | 6.0 | 7.0 |  |
Total long-term liabilities and deferred credits | 44.0 | 39.0 |  |
Total capitalization and liabilities | $ 3,551.0 | $ 3,382.0 |  |

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