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Debt Obligations (Narrative) (Details) (USD $)
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3 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | ||||||||||||||||||||||
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Mar. 31, 2014
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Mar. 31, 2013
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Dec. 31, 2013
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Mar. 31, 2014
Senior Unsecured Notes [Member]
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Jan. 31, 2010
Senior Unsecured Notes [Member]
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Mar. 31, 2014
Quarterly payments [Member]
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Mar. 31, 2014
Optional payments [Member]
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Mar. 31, 2014
4.00% Senior Notes Due 2015 [Member]
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Mar. 31, 2014
5.55% Senior Notes Due 2020 [Member]
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Dec. 31, 2010
5.25% Senior Unsecured Notes Due January 16, 2018 [Member]
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Mar. 31, 2014
5.25% Senior Unsecured Notes Due January 16, 2018 [Member]
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Jun. 30, 2013
2011 Credit Facility [Member]
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Sep. 30, 2011
2011 Credit Facility [Member]
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Mar. 31, 2014
2011 Credit Facility [Member]
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Sep. 30, 2011
2011 Credit Facility [Member]
2016 Term Loan [Member]
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Sep. 30, 2011
2011 Credit Facility [Member]
Revolving Credit Facility [Member]
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Mar. 31, 2014
Clearinghouse Credit Facilities [Member]
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Dec. 31, 2013
Clearinghouse Credit Facilities [Member]
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Mar. 31, 2014
3.875% senior unsecured notes due June 7, 2021 [Member]
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Dec. 31, 2013
3.875% senior unsecured notes due June 7, 2021 [Member]
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| Debt Instrument [Line Items] | ||||||||||||||||||||||||||||
| Debt instrument, principal outstanding | $ 400,000,000 | $ 600,000,000 | ||||||||||||||||||||||||||
| Debt instrument, interest rate | 4.00% | 5.55% | 5.25% | 3.875% | ||||||||||||||||||||||||
| Debt instrument, maturity date | 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 | ||||||||||||||||||||||||||
| Debt issuance costs | 8,000,000 | 3,000,000 | 5,000,000 | 7,000,000 | ||||||||||||||||||||||||
| Total debt obligations | 2,514,000,000 | [1] | 2,634,000,000 | [1] | 598,000,000 | 368,000,000 | 825,000,000 | [2] | 824,000,000 | [2] | ||||||||||||||||||
| Debt instrument, interest rate, maximum | 7.25% | 5.875% | ||||||||||||||||||||||||||
| Percentage of aggregate principal owed upon triggering event | 101.00% | 101.00% | ||||||||||||||||||||||||||
| Credit facility, borrowing capacity | 1,200,000,000 | 1,200,000,000 | 450,000,000 | 750,000,000 | 311,000,000 | 312,000,000 | ||||||||||||||||||||||
| Line of credit, outstanding amount | 11,000,000 | 0 | 11,000,000 | |||||||||||||||||||||||||
| Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Before Tax | (12,000,000) | (41,000,000) | 1,000,000 | |||||||||||||||||||||||||
| Proceed from term loan | 25,000,000 | [1] | ||||||||||||||||||||||||||
| Credit facility, additional borrowings | 25,000,000 | |||||||||||||||||||||||||||
| Credit facility, available capacity | 750,000,000 | |||||||||||||||||||||||||||
| Repayment of loan | 450,000,000 | |||||||||||||||||||||||||||
| Debt Instrument Decrease Repayments | 145,000,000 | [1] | (11,000,000) | (15,000,000) | (1,000,000) | [2] | ||||||||||||||||||||||
| Line of credit facility, available liquidity | 218,000,000 | 219,000,000 | ||||||||||||||||||||||||||
| Credit facility satisfy regulatory requirements | $ 93,000,000 | $ 93,000,000 | ||||||||||||||||||||||||||
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