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Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income - Reclassification out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Net Realized Gains on Sales of Investments	$ 11.6	$ 5.3	$ 24.0	$ 42.7
Net Impairment Losses Recognized in Earnings	(8.3)	(3.3)	(24.0)	(12.5)
Total Before Income Taxes	(33.2)	49.8	(37.1)	101.9
Income Tax Benefit (Expense)	14.9	(11.8)	20.7	(23.0)
Net Income (Loss)	(16.3)	37.9	(14.4)	81.1
Interest and Other Expenses	(22.0)	(25.7)	(65.0)	(82.0)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Net Income (Loss)	1.6	(2.3)	(4.5)	8.5
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Net Realized Gains on Sales of Investments	11.2	5.6	22.7	43.1
Net Impairment Losses Recognized in Earnings	(8.3)	(3.3)	(24.0)	(12.5)
Total Before Income Taxes	2.9	2.3	(1.3)	30.6
Income Tax Benefit (Expense)	(1.1)	(0.9)	0.4	(10.8)
Net Income (Loss)	1.8	1.4	(0.9)	19.8
Accumulated Defined Benefit Plans Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Out of Accumulated Other Comprehensive Income [Line Items]
Income Tax Benefit (Expense)	0.2	2.1	2.1	6.0
Net Income (Loss)	(0.2)	(3.7)	(3.6)	(11.3)
Interest and Other Expenses	$ (0.4)	$ (5.8)	$ (5.7)	$ (17.3)

X

- Definition

The Sum of (a) the cost of borrowed funds accounted for as interest that was charged against earnings during the period and (b) corporate general and administrative expenses charged against earnings during the period.

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section S99
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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Net Income
-URI http://asc.fasb.org/extlink&oid=51831255

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=51831270

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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