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Debt Obligations (Narrative) (Details)
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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 ($)
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Sep. 30, 2013
USD ($)
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Sep. 30, 2012
USD ($)
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Dec. 31, 2012
USD ($)
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Sep. 30, 2013
Senior Unsecured Notes [Member]
USD ($)
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Jan. 31, 2010
Senior Unsecured Notes [Member]
USD ($)
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Mar. 31, 2008
2.50% convertible senior notes due August 15, 2013 [Member]
USD ($)
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Sep. 30, 2013
2.50% convertible senior notes due August 15, 2013 [Member]
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Dec. 31, 2012
2.50% convertible senior notes due August 15, 2013 [Member]
USD ($)
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Sep. 30, 2013
4.00% Senior Notes Due 2015 [Member]
USD ($)
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Jun. 30, 2013
5.55% Senior Notes Due 2020 [Member]
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Sep. 30, 2013
5.55% Senior Notes Due 2020 [Member]
USD ($)
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Dec. 31, 2010
5.25% Senior Unsecured Notes Due January 16, 2018 [Member]
USD ($)
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Sep. 30, 2013
5.25% Senior Unsecured Notes Due January 16, 2018 [Member]
USD ($)
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Jun. 30, 2013
2011 Credit Facility [Member]
USD ($)
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May 31, 2013
2011 Credit Facility [Member]
USD ($)
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Sep. 30, 2011
2011 Credit Facility [Member]
USD ($)
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Sep. 30, 2013
2011 Credit Facility [Member]
USD ($)
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Sep. 30, 2013
2011 Credit Facility [Member]
USD ($)
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Sep. 30, 2011
2011 Credit Facility [Member]
2016 Term Loan [Member]
USD ($)
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Sep. 30, 2011
2011 Credit Facility [Member]
Revolving Credit Facility [Member]
USD ($)
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Sep. 30, 2013
Clearinghouse Credit Facilities [Member]
USD ($)
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Dec. 31, 2012
Clearinghouse Credit Facilities [Member]
USD ($)
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Sep. 30, 2013
3.875% senior unsecured notes due June 7, 2021 [Member]
USD ($)
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Sep. 30, 2013
3.875% senior unsecured notes due June 7, 2021 [Member]
EUR (€)
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| 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 | ||||||||||||||||||||||||||||
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