Other Noninterest Income and Other Noninterest Expense - Summary of Other Noninterest Income (Parenthetical) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Other Income and Expenses [Abstract]
Foreign Currency Transaction Unrealized Gain Loss Other Instruments Attributable To Noncontrolling Interests	$ (0.1)	$ (0.8)	$ 0.1	$ 0