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Commitments and Contingent Liabilities (Tables) | 12 Months Ended
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Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Guarantor Obligations [Table Text Block] |
|  | Maximum Potential Obligation
Commitment Period |  | 2013 |  | 2012
2026 |  | $ | 500.0 |  |  | $ | — |
2033 |  | 1,350.0 |  |  | — |
2035 |  | — |  |  | 560.0 |
2036 |  | 1,250.0 |  |  | — |
Credit Facilities [Table Text Block] | The following table provides additional information on the Company’s credit facilities as of December 31, 2013 and 2012 (dollars in millions):
|  |  |  | Amount Utilized(1) December 31, |  |
Facility Capacity |  | Maturity Date |  | 2013 |  | 2012 |  | Basis of Fees
$ | 850.0 |  |  | December 2015 |  | $ | 67.6 |  |  | $ | 402.9 |  |  | Senior unsecured long-term debt rating
200.0 |  |  | September 2019 |  | 200.0 |  |  | 200.0 |  |  | Fixed
120.0 |  |  | May 2016 |  | 85.1 |  |  | 100.0 |  |  | Fixed
270.0 |  |  | November 2017 |  | 270.0 |  |  | — |  |  | Fixed
100.0 |  |  | June 2017 |  | 89.4 |  |  | — |  |  | Fixed
58.4 |  |  | November 2014 |  | 58.4 |  |  | — |  |  | Fixed
132.5 |  |  | March 2019 |  | 132.5 |  |  | — |  |  | Fixed
(1) | Represents issued but undrawn letters of credit. There was no cash borrowed for the periods presented.
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block] | Future minimum office space annual rentals under non-cancelable operating leases along with associated sublease income at December 31, 2013 are as follows (dollars in thousands):
|  | Operating Leases |  | Sublease Income
2014 |  | $ | 16,905 |  |  | $ | 827 |
2015 |  | 10,862 |  |  | 827 |
2016 |  | 8,434 |  |  | 776 |
2017 |  | 5,638 |  |  | 160 |
2018 |  | 4,466 |  |  | — |
Thereafter |  | 15,489 |  |  | — |

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- Definition Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6453985&loc=d3e41502-112717 + Details
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- Definition Tabular disclosure of each guarantee obligation, or each group of similar guarantee obligations, including (a) the nature of the guarantee, including its term, how it arose, and the events or circumstances that would require the guarantor to perform under the guarantee; (b) the maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee; (c) the current carrying amount of the liability, if any, for the guarantor's obligations under the guarantee; and (d) the nature of any recourse provisions under the guarantee, and any assets held either as collateral or by third parties, and any relevant related party disclosure. Excludes disclosures about product warranties. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12265-110248 + Details
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- Definition Tabular disclosure of short-term or long-term contractual arrangements with lenders, including letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e),(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph f -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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