Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net Income (Loss) Attributable to Parent	$ (2.1)	$ 13.5
Other Comprehensive Income Before Income Taxes:
Unrealized Holding Gains	100.7	53.3
Foreign Currency Translation Adjustments	0.1	(0.9)
Decrease in Net Unrecognized Postretirement Benefit Costs	1.8	5.4
Other Comprehensive Income Before Income Taxes	102.6	57.8
Other Comprehensive Income Tax Expense	(36.2)	(20.2)
Other Comprehensive Income	66.4	37.6
Comprehensive Income (Loss), Net of Tax, Attributable to Parent	$ 64.3	$ 51.1