Derivatives Derivatives (Forward Contract Netting) (Details) (Forward contracts, USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Derivative [Line Items]
Derivative Asset	$ 0	$ 0	[1]
Derivative Liability	(0.1)	(0.1)
Net amounts recognized in Other Assets	(0.1)	(0.1)
United States of America, Dollars
Derivative [Line Items]
Derivative Asset	0	0	[1]
Derivative Liability	0	0
Net amounts recognized in Other Assets	0	0
Euro Member Countries, Euro
Derivative [Line Items]
Derivative Asset	0	0	[1]
Derivative Liability	(0.1)	(0.1)
Net amounts recognized in Other Assets	(0.1)	(0.1)
GBP
Derivative [Line Items]
Derivative Asset	0	0	[1]
Derivative Liability	0	0
Net amounts recognized in Other Assets	$ 0	$ 0

[1] Amount equal to fair value of instrument as recognized in investments.