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Required asset coverage ratio

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Represents the ratio of current assets to current liabilities.

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Number of institutional investors that purchased debt in a private placement offering.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Face (par) amount of the original debt instrument that was repurchased.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees).

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For an unclassified balance sheet, the carrying amount (net of accumulated amortization) as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain.

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The effective interest rate during the reporting period.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Debt and Credit Agreements - Narrative (Details)			1 Months Ended					12 Months Ended
Debt and Credit Agreements - Narrative (Details)	Dec. 31, 2015 USD ($) fiscal_period	Apr. 17, 2015 USD ($)	Sep. 30, 2014 USD ($) Investor Tranche	Dec. 31, 2010 USD ($) Investor Tranche	Dec. 31, 2008 USD ($) Investor	Jul. 31, 2008 USD ($) Investor Tranche	Jul. 31, 2001 USD ($) Investor Tranche	Dec. 31, 2015 USD ($) fiscal_period	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Debt Instrument [Line Items]
2016	$ 20,000,000							$ 20,000,000
2018	312,000,000							312,000,000
2020	$ 100,000,000							100,000,000
Repayments of debt								$ 604,000,000	$ 1,427,000,000	$ 895,000,000
7.33% weighted-average senior notes
Debt Instrument [Line Items]
Weighted-average interest rate (as a percent)	7.33%							7.33%	7.33%
Debt	$ 20,000,000							$ 20,000,000	$ 20,000,000
6.51% weighted-average senior notes
Debt Instrument [Line Items]
Weighted-average interest rate (as a percent)	6.51%							6.51%	6.51%
Debt	$ 425,000,000							$ 425,000,000	$ 425,000,000
9.78% senior notes
Debt Instrument [Line Items]
Interest rate (as a percent)	9.78%							9.78%	9.78%
Debt	$ 67,000,000							$ 67,000,000	$ 67,000,000
5.58% weighted-average senior notes
Debt Instrument [Line Items]
Weighted-average interest rate (as a percent)	5.58%							5.58%	5.58%
Debt	$ 175,000,000							$ 175,000,000	$ 175,000,000
3.65% weighted-average senior notes
Debt Instrument [Line Items]
Weighted-average interest rate (as a percent)	3.65%							3.65%	3.65%
Debt	$ 925,000,000							$ 925,000,000	$ 925,000,000
Revolving credit facility
Debt Instrument [Line Items]
Minimum required asset coverage ratio								1.75
Fiscal quarters for reduction in coverage ratio \| fiscal_period								4
Minimum required annual coverage ratio								2.8
Debt issuance costs	$ 7,800,000	$ 1,100,000
Maximum borrowing capacity on line of credit		3,400,000,000.0
Available line of credit		1,800,000,000
Minimum current ratio	1.0							1.0
Debt	$ 413,000,000							$ 413,000,000	$ 140,000,000
Remaining borrowing capacity on line of credit	$ 1,400,000,000							$ 1,400,000,000
Interest rate during period								2.20%	2.20%	2.30%
Senior Notes
Debt Instrument [Line Items]
Minimum required asset coverage ratio	1.75
Fiscal quarters for reduction in coverage ratio \| fiscal_period								4
Minimum required annual coverage ratio								2.8
Deferred financing costs capitalized	$ 1,900,000							$ 1,900,000
Senior Notes \| 7.33% weighted-average senior notes
Debt Instrument [Line Items]
Weighted-average interest rate (as a percent)	7.33%							7.33%
Principal							$ 170,000,000
Number of institutional investors \| Investor							7
Number of debt tranches \| Tranche							3
Principal repaid	$ 150,000,000							$ 150,000,000
Senior Notes \| 6.51% weighted-average senior notes
Debt Instrument [Line Items]
Principal						$ 425,000,000
Number of institutional investors \| Investor						41
Number of debt tranches \| Tranche						3
Senior Notes \| 9.78% senior notes
Debt Instrument [Line Items]
Principal					$ 67,000,000
Number of institutional investors \| Investor					4
Term					10 years
Interest rate (as a percent)					9.78%
Senior Notes \| 5.58% weighted-average senior notes
Debt Instrument [Line Items]
Principal				$ 175,000,000
Number of institutional investors \| Investor				8
Number of debt tranches \| Tranche				3
Senior Notes \| 3.65% weighted-average senior notes
Debt Instrument [Line Items]
Weighted-average interest rate (as a percent)			3.65%
Principal			$ 925,000,000
Number of institutional investors \| Investor			24
Number of debt tranches \| Tranche			3
Debt issuance costs			$ 5,600,000
Revolving credit facility
Debt Instrument [Line Items]
Minimum required asset coverage ratio	1.75
Revolving credit facility \| Accordion Feature, Amended Facility
Debt Instrument [Line Items]
Maximum borrowing capacity on line of credit		$ 500,000,000
Minimum \| Revolving credit facility
Debt Instrument [Line Items]
Unused capacity fee percentage		0.30%
Maximum \| Revolving credit facility
Debt Instrument [Line Items]
Unused capacity fee percentage		0.50%
December 31, 2016 \| Senior Notes
Debt Instrument [Line Items]
Maximum leverage coverage ratio	4.75
December 31, 2016 \| Revolving credit facility
Debt Instrument [Line Items]
Maximum leverage coverage ratio	4.75
December 31, 2017 \| Senior Notes
Debt Instrument [Line Items]
Minimum required asset coverage ratio	1.25
Maximum leverage coverage ratio	4.25
December 31, 2017 \| Revolving credit facility
Debt Instrument [Line Items]
Minimum required asset coverage ratio	1.25
Maximum leverage coverage ratio	4.25
March 31, 2018 \| Senior Notes
Debt Instrument [Line Items]
Minimum required asset coverage ratio	1.75
Maximum leverage coverage ratio	3.50
March 31, 2018 \| Revolving credit facility
Debt Instrument [Line Items]
Minimum required asset coverage ratio	1.75
Maximum leverage coverage ratio	3.50
Maintain coverage ratio for 2 consecutive quarters or receive investment grade rating from Standard and Poors or Moody's \| Senior Notes
Debt Instrument [Line Items]
Maximum leverage coverage ratio	3.0
Fiscal quarters for reduction in coverage ratio \| fiscal_period	2
Maintain coverage ratio for 2 consecutive quarters or receive investment grade rating from Standard and Poors or Moody's \| Revolving credit facility
Debt Instrument [Line Items]
Maximum leverage coverage ratio	3.0							3.0
Fiscal quarters for reduction in coverage ratio \| fiscal_period	2							2
Maintain coverage ratio for 2 consecutive quarters or receive investment grade rating from Standard and Poors or Moody's \| Minimum \| Revolving credit facility
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Maintain coverage ratio for 2 consecutive quarters or receive investment grade rating from Standard and Poors or Moody's \| Maximum \| Revolving credit facility
Debt Instrument [Line Items]
Basis spread on variable rate	2.25%
Increase in rate based upon coverage and leverage ratio \| Senior Notes
Debt Instrument [Line Items]
Basis spread on variable rate								0.00%
Increase in rate based upon coverage and leverage ratio \| Minimum \| Senior Notes
Debt Instrument [Line Items]
Basis spread on variable rate	0.00%
Increase in rate based upon coverage and leverage ratio \| Minimum \| Revolving credit facility
Debt Instrument [Line Items]
Basis spread on variable rate	0.50%
Increase in rate based upon coverage and leverage ratio \| Maximum \| Senior Notes
Debt Instrument [Line Items]
Basis spread on variable rate	1.25%
Increase in rate based upon coverage and leverage ratio \| Maximum \| Revolving credit facility
Debt Instrument [Line Items]
Basis spread on variable rate	3.00%