Fair Value Measurements and the Fair Value Option (Derivatives Gain (Loss)) (Details) (Foreign Exchange Forward [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Net Investment Hedging [Member] | Other Comprehensive Income (Loss) [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative loss, recorded in other comprehensive income (loss)	$ 0.2	$ 0.7
Fair Value Hedging [Member] | General and Administrative Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative loss, recorded in income statement	$ 0.1	$ 0.2