Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net Income	$ 55.6	$ 2.0	$ 101.5	$ 50.2
Other Comprehensive Income Before Income Taxes:
Unrealized Holding Gains	47.7	141.5	121.6	164.8
Foreign Currency Translation Adjustments	0.2	0	1.5	0.6
Amortization of Unrecognized Postretirement Benefit Costs	4.4	2.1	12.0	6.5
Other Comprehensive Income Before Income Taxes	52.3	143.6	135.1	171.9
Other Comprehensive Income Tax Expense	(18.7)	(51.0)	(48.0)	(61.2)
Other Comprehensive Income	33.6	92.6	87.1	110.7
Total Comprehensive Income	$ 89.2	$ 94.6	$ 188.6	$ 160.9