Supplemental Information (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of Components of Interest Expense
Investment income	$ 2.0	$ 1.8	$ 1.9
Interest expense, net	14.5	17.1	16.8
Interest Expense, Other	$ 16.5	$ 18.9	$ 18.7