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Financing and Other Activities (Narrative) (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Mar. 31, 2013 | Sep. 30, 2013 | Sep. 30, 2012
Repurchase Of Collateral Finance Facility Notes [Abstract] |  |  |
Debt Instrument Repurchased Face Amount | $ 160,000,000 |  |
Repayments of Long-term Debt | 112,000,000 |  |
Gains Losses On Extinguishment Of Collateral Finance Securities | 46,500,000 |  |
Payments to Acquire Businesses, Net of Cash Acquired |  | 12,500,000 |
Noncash or Part Noncash Acquisition, Value of Assets Acquired |  | 147,300,000 |
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed |  | 134,800,000 |
Debt Instrument, Issuance Date |  | Sep. 19, 2013 |
Debt Instrument, Interest Rate, Stated Percentage |  | 4.70% |
Debt Instrument, Maturity Date |  | Sep. 15, 2023 |
Debt Instrument, Face Amount |  | 400,000,000 |
Proceeds from Issuance of Long-term Debt and Capital Securities, Net |  | 395,100,000 |
Payments of Debt Issuance Costs |  | $ 3,400,000 | $ 6,255,000

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