Consolidated Statement of Comprehensive Income Parentheticals (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Other Comprehensive Income (Loss), Tax, Parenthetical Disclosures [Abstract]
Unrealized Gain (Loss) on Securities, Tax	$ (0.5)	$ 0.2	$ 0.2	$ 0.8
Unrealized Loss on Derivatives, Tax	0	0	(0.1)	0
Defined Benefit Pension and Other Postretirement Benefit Plans, Tax	$ 0.4	$ 0.2	$ 0.7	$ 0.5