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Reconciliation of Total Operating Revenue and Operating Income by Segment to Revenue and Net Income (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Operating Revenue by Segment |  |  |  |  |  |  |  |  | $ 10,282.9 | $ 10,168.5 | $ 10,079.3
Net Realized Investment Gain (Loss) |  |  |  |  |  |  |  |  | (4.9) | 24.7 | 11.7
Revenue | 2,604.8 | 2,545.6 | 2,564.5 | 2,563.1 | 2,593.1 | 2,527.9 | 2,510.6 | 2,561.6 | 10,278.0 | 10,193.2 | 10,091.0
Operating Income by Segment |  |  |  |  |  |  |  |  | 262.1 | 1,306.6 | 1,280.6
Net Realized Investment Gain (Loss) |  |  |  |  |  |  |  |  | (4.9) | 24.7 | 11.7
Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  | 21.8 | 445.2 | 439.7
Net Income | $ (425.4) | $ 205.6 | $ 229.8 | $ 225.4 | $ 225.8 | $ 220.8 | $ 209.7 | $ 229.8 | $ 235.4 | $ 886.1 | $ 852.6

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