Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net Income	$ 217.7	$ 103.4	$ 74.5
Unrealized Holding Gains (Losses)	(362.8)	96.7	201.2
Foreign Currency Translation Adjustments	0.2	1.6	0.4
Decrease (Increase) in Net Unrecognized Postretirement Benefit Costs	86.6	(13.2)	(45.2)
Other Comprehensive Income (Loss) Before Income Taxes	(276.0)	85.1	156.4
Other Comprehensive Income Tax Benefit (Expense)	98.6	(30.4)	(55.8)
Other Comprehensive Income (Loss)	(177.4)	54.7	100.6
Total Comprehensive Income	$ 40.3	$ 158.1	$ 175.1