v2.4.0.8

Debt Obligations (Narrative) (Details) | 3 Months Ended | 9 Months Ended |  |  |  | 3 Months Ended | 9 Months Ended |  | 9 Months Ended | 3 Months Ended |  | 1 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | 21 Months Ended |  |  |  | 9 Months Ended |
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Sep. 30, 2012 USD ($) | Sep. 30, 2013 USD ($) | Sep. 30, 2012 USD ($) | Dec. 31, 2012 USD ($) | Sep. 30, 2013 Senior Unsecured Notes [Member] USD ($) | Jan. 31, 2010 Senior Unsecured Notes [Member] USD ($) | Mar. 31, 2008 2.50% convertible senior notes due August 15, 2013 [Member] USD ($) | Sep. 30, 2013 2.50% convertible senior notes due August 15, 2013 [Member] | Dec. 31, 2012 2.50% convertible senior notes due August 15, 2013 [Member] USD ($) | Sep. 30, 2013 4.00% Senior Notes Due 2015 [Member] USD ($) | Jun. 30, 2013 5.55% Senior Notes Due 2020 [Member] | Sep. 30, 2013 5.55% Senior Notes Due 2020 [Member] USD ($) | Dec. 31, 2010 5.25% Senior Unsecured Notes Due January 16, 2018 [Member] USD ($) | Sep. 30, 2013 5.25% Senior Unsecured Notes Due January 16, 2018 [Member] USD ($) | Jun. 30, 2013 2011 Credit Facility [Member] USD ($) | May 31, 2013 2011 Credit Facility [Member] USD ($) | Sep. 30, 2011 2011 Credit Facility [Member] USD ($) | Sep. 30, 2013 2011 Credit Facility [Member] USD ($) | Sep. 30, 2013 2011 Credit Facility [Member] USD ($) | Sep. 30, 2011 2011 Credit Facility [Member] 2016 Term Loan [Member] USD ($) | Sep. 30, 2011 2011 Credit Facility [Member] Revolving Credit Facility [Member] USD ($) | Sep. 30, 2013 Clearinghouse Credit Facilities [Member] USD ($) | Dec. 31, 2012 Clearinghouse Credit Facilities [Member] USD ($) | Sep. 30, 2013 3.875% senior unsecured notes due June 7, 2021 [Member] USD ($) | Sep. 30, 2013 3.875% senior unsecured notes due June 7, 2021 [Member] EUR (€)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, principal outstanding |  |  |  |  |  |  | $ 475,000,000 |  |  |  | $ 400,000,000 |  | $ 600,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, interest rate |  |  |  |  |  |  | 2.50% | 2.50% |  |  | 4.00% |  | 5.55% |  | 5.25% |  |  |  |  |  |  |  |  |  | 3.875% |  |
Debt instrument, maturity date |  |  |  |  |  |  | Aug. 15, 2013 | Aug. 15, 2013 |  |  | Jan. 15, 2015 | Jan. 15, 2020 |  | Jan. 16, 2018 |  |  |  | Sep. 19, 2016 |  |  |  |  |  |  | Jun. 07, 2021 |  |
Debt instrument, face amount |  |  |  |  |  | 1,000,000,000 |  |  |  |  |  |  |  | 370,000,000 |  |  |  |  |  |  |  |  |  |  |  |  | 600,000,000
Debt issuance costs |  |  |  |  | 8,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 | 5,000,000 |  |  |  |  | 7,000,000 |  |
Total debt obligations |  | 2,718,000,000 |  | 1,976,000,000 |  |  |  |  | 91,000,000 | [1] | 399,000,000 |  | 598,000,000 |  | 368,000,000 |  |  |  |  |  |  |  |  |  | 811,000,000 | [2] |
Debt instrument, interest rate, maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.25% |  |  |  |  |  |  |  |  |  | 5.875% |  |
Percentage of aggregate principal owed upon triggering event |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 101.00% |  |  |  |  |  |  |  |  |  | 101.00% |  |
Accretion of debt discounts | 1,000,000 | 2,000,000 | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization expense |  | 2,000,000 | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |
Credit facility, borrowing capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,200,000,000 | 1,200,000,000 | 1,200,000,000 | 450,000,000 | 750,000,000 | 313,000,000 | 310,000,000 |  |  |
Line of credit, outstanding amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |
Line of credit facility, frequency of payments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | quarterly |  |  |  |  |  |  |  |
Proceed from term loan |  | 902,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 782,000,000 | [2] |
Credit facility, additional borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,000,000 | 50,000,000 |  |  |  |  |  |  |  |  |  |
Credit facility, available capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 568,000,000 | 568,000,000 |  |  |  |  |  |  |
Line of credit facility, quarterly principal payment percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |  |  |  |
Line of credit facility, quarterly principal payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 34,000,000 |  |  |  |  |  |  |  |
Repayment of loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 450,000,000 |  |  |  |  |  |  |  |  |
Line of credit facility, available liquidity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 220,000,000 | 217,000,000 |  |  |
Credit facility satisfy regulatory requirements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 93,000,000 | 93,000,000 |  |  |
Interest Expense Subordinated Notes And Debentures |  | $ 2,000,000 | $ 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |
[1] | See “2.50% Convertible Senior Notes” below for further discussion.
[2] | See “Senior Unsecured Notes” below for further discussion.

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