Legal Proceedings - Loss Contingencies (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended
	Dec. 10, 2010 Claimant	Mar. 07, 2013 Positive Outcome of Litigation [Member]	Feb. 02, 2013 Computer Network Intrusion [Member] Threatened Litigation [Member]
Loss Contingencies [Line Items]
Approximate claims asserted against the company's acquiring bank	$ 15.6
Number of claimants	2
Loss in period			15.4
Gain contingency		$ 13.3