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Subsequent Events - Additional Information (Details) - Subsequent Event - USD ($)
$ / shares in Units, $ in Millions
Aug. 11, 2015
Jul. 15, 2015
Aug. 05, 2015
Subsequent Event [Line Items]      
Pro-rata dividend payable to shareholders   $ 0.4418  
Cash dividend declared per share $ 0.60    
Dividend declared date Aug. 11, 2015    
Cash dividend payable date Oct. 15, 2015    
Dividend record date Sep. 30, 2015    
C S L Capital Llc | 8.25% Senior Notes due 2023      
Subsequent Event [Line Items]      
Issuance of senior notes, principal amount     $ 1,110
Issuance senior notes, stated percentage     8.25%