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Subsequent Events (Details) - Common Shares - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
1 Months Ended 9 Months Ended
Nov. 03, 2015
Sep. 30, 2015
Subsequent Event [Line Items]    
Common shares repurchased during period, Number of shares   2,026
Common shares repurchased during period, Aggregate amount   $ 211.5
Common shares repurchased during period, Average cost per share, in usd per share   $ 104.39
Subsequent Event    
Subsequent Event [Line Items]    
Common shares repurchased during period, Number of shares 286  
Common shares repurchased during period, Aggregate amount $ 30.6  
Common shares repurchased during period, Average cost per share, in usd per share $ 107.11