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Subsequent Events (Details) - $ / shares
3 Months Ended 9 Months Ended
Nov. 03, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Subsequent Event [Line Items]          
Dividends declared per share   $ 0.62 $ 0.57 $ 1.86 $ 1.71
Subsequent Event          
Subsequent Event [Line Items]          
Dividends declared per share $ 0.65