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Debt (Narrative) (Details) (USD $) | 12 Months Ended |  |  | 0 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended |  | 12 Months Ended | 0 Months Ended | 12 Months Ended |  | 12 Months Ended | 0 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Sep. 19, 2013 Senior Notes Due 2023 [Member] | Dec. 31, 2013 Senior Notes Due 2023 [Member] | Dec. 31, 2013 Junior Subordinated Debentures Due 2065 [Member] | Dec. 31, 2013 Senior Notes Due 2019 [Member] | May 27, 2011 Senior Notes Due 2021 [Member] | Dec. 31, 2011 Senior Notes Due 2021 [Member] | Dec. 31, 2013 Senior Notes Due 2021 [Member] | Dec. 31, 2011 Senior Notes Due 2011 [Member] | Aug. 21, 2012 Subordinated Debentures Due 2042 [Member] | Dec. 31, 2012 Subordinated Debentures Due 2042 [Member] | Dec. 31, 2013 Subordinated Debentures Due 2042 [Member] | Dec. 31, 2013 Senior Notes Due 2017 [Member] | Jun. 05, 2011 Remarketed on March 4 2011 [Member] | Mar. 04, 2011 Remarketed on March 4 2011 [Member] security warrant | Dec. 31, 2011 Remarketed on March 4 2011 [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  | 4.70% | 4.70% | 6.75% | 6.45% | 5.00% |  | 5.00% |  | 6.20% |  | 6.20% | 5.625% |  |  |
Debt Instrument, Maturity Date |  |  |  | Sep. 15, 2023 |  | Dec. 31, 2065 | Dec. 31, 2019 | Jun. 01, 2021 |  |  |  | Sep. 15, 2042 |  |  | Dec. 31, 2017 |  |  |
Debt Instrument, Face Amount |  |  |  | $ 400,000,000.0 | $ 400,000,000 | $ 400,000,000 | $ 400,000,000 | $ 400,000,000.0 |  | $ 400,000,000 |  | $ 400,000,000.0 |  | $ 400,000,000 | $ 300,000,000 |  |  |
Proceeds From Issuance Of Subordinated Long Term Debt |  |  |  |  | 395,100,000 |  |  |  |  |  |  |  | 393,700,000 |  |  |  |  |
Debt Issuance Costs Incurred And Capitalized |  |  |  |  | 3,400,000 |  |  |  | 3,400,000 |  |  |  | 6,300,000 |  |  |  |  |
Number Of Trust Preferred Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,500,000 |
Aggregate Value Of Trust Preferred Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 158,200,000 |
Warrant Conversion Value In Common Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.2508 |
Warrants Excercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,400,000 |
Price Per Warrant |  |  | 35.44 |  |  |  |  |  |  |  |  |  |  |  |  |  | 35.44 |
Number Of Common Shares Issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,500,000 |
Unexercised Warrant Cash Redemption Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14.56 |
Trust Preferred Security Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 35.44 |  |
Trust Preferred Securities Fixed Annual Distribution Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.375% |  |
Loss On Unamortized Issuance Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,400,000
Proceeds from Issuance of Senior Long-term Debt |  |  |  |  |  |  |  |  | 394,400,000 |  |  |  |  |  |  |  |  |
Repayments of Debt |  |  |  |  |  |  |  |  |  |  | 200,000,000 |  |  |  |  |  |  |
Syndicated Revolving Credit Facility Capacity | 850,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Syndicated Revolving Credit Facility Capacity Undrawn Outstanding | 67,600,000 | 402,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt, Weighted Average Interest Rate | 5.76% | 5.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Covenant Default, Amount of Non-Payment | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt | 2,214,350,000 | 1,815,253,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Year Four | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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