Derivatives and Hedging Activities Non-designated Hedges Text description (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012 Not Designated as Hedging Instrument [Member]	Sep. 30, 2012 Interest Rate Swap [Member] Not Designated as Hedging Instrument [Member] contracts	Dec. 31, 2011 Interest Rate Swap [Member] Not Designated as Hedging Instrument [Member] contracts	Sep. 30, 2012 Foreign Exchange Contract [Member] Not Designated as Hedging Instrument [Member] contracts	Dec. 31, 2011 Foreign Exchange Contract [Member] Not Designated as Hedging Instrument [Member] contracts
Derivative [Line Items]
Document Period End Date	Sep. 30, 2012
Derivative, Collateral, Obligation to Return Cash			$ 9.4	$ 9.9
Derivative Credit Risk Valuation Adjustment, Derivative Assets		0.1
Derivative, Number of Instruments Held			12	12	11	2
Derivative, Notional Amount			$ 101.9	$ 102.7	$ 11.2	$ 0.4