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Subsequent Events Subsequent Events (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Jan. 27, 2015
Subsequent Event [Line Items]    
Stock Repurchase Program, Authorized Amount $ 30.0us-gaap_StockRepurchaseProgramAuthorizedAmount1  
Subsequent Event    
Subsequent Event [Line Items]    
Stock Repurchase Program, Authorized Amount   $ 180.0us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember