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Financing Activities (Narrative) (USD $) | 9 Months Ended
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Sep. 30, 2012
Financing Activities And Stock Transactions [Abstract] |
Debt Instrument, Issuance Date | August 21, 2012
Debt Instrument, Interest Rate, Stated Percentage | 6.20%
Debt Instrument, Maturity Date | Sep. 15, 2042
Debt Instrument, Face Amount | $ 400,000,000
Proceeds from Issuance of Subordinated Long-term Debt | 393,700,000
Debt Issuance Costs Incurred And Capitalized | $ 6,300,000

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