Condensed Consolidated Statements of Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net Income	$ 58.4	$ 43.6
Other Comprehensive Income (Loss) Before Income Taxes:
Unrealized Holding Gains (Losses)	(48.0)	1.3
Foreign Currency Translation Adjustments	(0.2)	0.7
Amortization of Unrecognized Postretirement Benefit Costs	5.4	4.4
Other Comprehensive Income (Loss) Before Income Taxes	(42.8)	6.4
Other Comprehensive Income Tax Benefit (Expense)	16.2	(2.3)
Other Comprehensive Income (Loss)	(26.6)	4.1
Total Comprehensive Income	$ 31.8	$ 47.7