Derivatives Derivatives (Unrealized and Realized Derivative Gains (Losses) Forward Contracts) (Details) (Forward contracts, USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Derivative [Line Items]
Change in fair value of derivatives, included in other revenue	$ (0.1)	$ (0.3)
Derivative, Fair Value, Net	(0.1)	(0.1)	0
GBP
Derivative [Line Items]
Change in fair value of derivatives, included in other revenue	0	0
Derivative, Fair Value, Net	0	0
Euro Member Countries, Euro
Derivative [Line Items]
Change in fair value of derivatives, included in other revenue	0.1	(0.1)
Derivative, Fair Value, Net	(0.1)	(0.1)
SEK
Derivative [Line Items]
Change in fair value of derivatives, included in other revenue	0	0
Derivative, Fair Value, Net	0	0
United States of America, Dollars
Derivative [Line Items]
Change in fair value of derivatives, included in other revenue	(0.2)	(0.2)
Derivative, Fair Value, Net	$ 0	$ 0