Derivatives (Unrealized and Realized Derivative Gains (Losses) Forward Contracts) (Details) (Forward Contracts, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Realized and unrealized gains (losses)	$ 0.4
Derivative, fair value, net	(0.2)	(0.1)
United States of America, Dollars
Derivative [Line Items]
Realized and unrealized gains (losses)	(0.3)
Derivative, fair value, net	(0.3)
Sweden, Kronor
Derivative [Line Items]
Realized and unrealized gains (losses)	0
Derivative, fair value, net	0
Euro Member Countries, Euro
Derivative [Line Items]
Realized and unrealized gains (losses)	0
Derivative, fair value, net	0
United Kingdom, Pounds
Derivative [Line Items]
Realized and unrealized gains (losses)	0.7
Derivative, fair value, net	$ 0.1