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Acquisitions - Grupo Finmart (Details) - USD ($)
$ in Millions
Aug. 31, 2015
Jun. 30, 2014
Apr. 01, 2013
Sep. 30, 2015
Jan. 30, 2012
Grupo Finmart [Member]          
Business Acquisition [Line Items]          
Payments to maintain interest in subsidiary     $ 9.2    
Ownership interest in subsidiaries 94.00% 76.00% 60.00% 94.00%  
Additional ownership interest acquired 18.00% 16.00%      
Payments to acquire additional interest in subsidiaries $ 29.6 $ 28.7      
Ownership percentage by noncontrolling owners 6.00%        
Grupo Finmart [Member]          
Business Acquisition [Line Items]          
Acquisition interest         60.00%