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Supplemental Condensed Consolidating Financial Information - Additional Information (Details) $ in Millions | Sep. 30, 2018 USD ($)
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Condensed Financial Statements, Captions [Line Items] |
Aggregate principal amount of notes outstanding | $ 1,344
Senior Notes | 5.375% Notes |
Condensed Financial Statements, Captions [Line Items] |
Aggregate principal amount of notes outstanding | $ 700
Percentage of contractual interest rate on Notes | 5.375%

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