CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Unrealized holding gains (losses) on securities, tax	$ 0.4	$ 1.1	$ 0.4	$ 3.1
Other, tax	0	0	0	0
Net gains (losses) arising during the period, tax	$ 1.4	$ 1.1	$ 4.6	$ 3.3