Debt - Senior Notes (Details) - Unsecured Debt [Member]	12 Months Ended
Dec. 31, 2018 USD ($)
Senior Notes 5.50% Due in 2019 [Member]
Debt Instrument [Line Items]
Fixed interest rate	5.50%
Principal amount	$ 750,000,000
Senior Notes 4.625% Due in 2020 [Member]
Debt Instrument [Line Items]
Fixed interest rate	4.625%
Principal amount	$ 500,000,000
Senior Notes [Member]
Debt Instrument [Line Items]
Redemption price percentage	101.00%

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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
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- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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- Definition

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.

+ References

No definition available.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
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