Derivatives (Unrealized and Realized Derivative Gains (Losses) Forward Contracts) (Details) (Forward Contracts, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Realized and unrealized gains (losses)	$ (0.1)	$ 0.4
Sales/settlements	0.1	(0.5)
Derivative, fair value, net	(0.1)	(0.2)	(0.1)	(0.1)
United States of America, Dollars
Derivative [Line Items]
Realized and unrealized gains (losses)	0	(0.3)
Derivative, fair value, net	0		0
Sweden, Kronor
Derivative [Line Items]
Realized and unrealized gains (losses)	0	0
Derivative, fair value, net	0		0
Euro Member Countries, Euro
Derivative [Line Items]
Realized and unrealized gains (losses)	(0.1)
Derivative, fair value, net	(0.1)		(0.1)
United Kingdom, Pounds
Derivative [Line Items]
Realized and unrealized gains (losses)	0	0.7
Derivative, fair value, net	$ 0		$ 0