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Supplemental guarantor financial information (Narrative) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Oct. 31, 2019	Dec. 31, 2018	Jun. 30, 2015
Debt Instrument [Line Items]
Debt	$ 29,486,131		$ 29,507,587
Operating lease right of use asset and liability	$ 1,300,000
Junior Subordinated Notes | Subordinated
Debt Instrument [Line Items]
Debt		$ 750,000		$ 500,000
Debt, fixed interest rate		5.875%		6.50%

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- Definition

Operating Lease Right of Use Asset And Liability

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
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-Section S99
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-Topic 942
-SubTopic 210
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