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Subsequent Event Subsequent Event (Details)
Dec. 31, 2014
Jan. 21, 2015
Subsequent Event [Line Items]    
Stock Repurchase Program, Number of Shares Authorized to be Repurchased 19,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased  
Stock Repurchase Program, Remaining Number of Shares Authorized to be Repurchased 5,200,000us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased  
Subsequent Event [Member]    
Subsequent Event [Line Items]    
Stock Repurchase Program, Number of Shares Authorized to be Repurchased   20,000,000.0us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember