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Debt - Senior Notes (Details) - USD ($)	Dec. 31, 2018	Jun. 06, 2017
4.875% Notes
Debt Instrument [Line Items]
Percentage of contractual interest rate	4.875%
5.375% Senior Notes due 2022
Debt Instrument [Line Items]
Percentage of contractual interest rate	5.375%
Senior Notes | 4.875% Notes
Debt Instrument [Line Items]
Principal amount		$ 330,000,000
Percentage of contractual interest rate	4.875%	4.875%
Senior Notes | 5.375% Senior Notes due 2022
Debt Instrument [Line Items]
Principal amount	$ 700,000,000
Percentage of contractual interest rate	5.375%

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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- Definition

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

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