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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
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Segment Reporting, Revenue Reconciling Item [Line Items] |  |
Operating Revenue by Segment | $ 2,614.5 | $ 2,598.9
Net Realized Investment Gain (Loss) | 10.3 | 12.4
Revenue | 2,624.8 | 2,611.3
Operating Income (Loss) | 308.4 | 309.2
Net Realized Investment Gain (Loss) | 10.3 | 12.4
Non-operating Retirement-related Loss | (14.9) | (11.6)
Income Tax Expense (Benefit) | (91.2) | (96.1)
Net Income | $ 212.6 | $ 213.9

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