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Supplemental Condensed Consolidating Financial Information - Additional Information (Details)
$ in Millions
Sep. 30, 2018
USD ($)
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%