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Due from/to brokers (Details) (USD $)
In Millions, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Dec. 31, 2012
Due to and from Broker-Dealers and Clearing Organizations [Abstract]      
Due to brokers $ 14.4tpre_PayablestoBrokerDealersandClearingOrganizationsNet $ 268.5tpre_PayablestoBrokerDealersandClearingOrganizationsNet $ 90.8tpre_PayablestoBrokerDealersandClearingOrganizationsNet