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Subsequent Events Narrative (Details) - USD ($)
$ in Millions
Nov. 02, 2017
Sep. 30, 2017
Subsequent Event [Line Items]    
Stock Repurchase Program, Authorized Amount   $ 410.0
Subsequent Event    
Subsequent Event [Line Items]    
Stock Repurchase Program, Authorized Amount $ 610.0  
Stock Repurchase Program, Remaining Authorized Repurchase Amount $ 301.4