Income Tax (Tables)

12 Months Ended

Dec. 31, 2012

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

Total income tax expense (benefit) is allocated as follows:

	Year Ended December 31
	2012			2011			2010
	(in millions of dollars)
Net Income	$	355.1		$	49.1		$	441.2
Stockholders' Equity - Additional Paid-in Capital
Stock-Based Compensation	3.5			(3.3		)	(2.7		)
Stockholders' Equity - Accumulated Other Comprehensive Income (Loss)
Change in Net Unrealized Gains on Securities Not Other-Than Temporarily Impaired	467.7			799.4			519.1
Change in Net Unrealized Gains and Losses on Securities Other-Than Temporarily Impaired	—			(1.1		)	(0.5		)
Change in Net Gain on Cash Flow Hedges	(4.3		)	25.2			(5.0		)
Change in Adjustment to Reserves for Future Policy and Contract Benefits, Net of Reinsurance and Other	(325.6		)	(701.5		)	(499.6		)
Change in Foreign Currency Translation Adjustment	—			—			0.6
Change in Unrecognized Pension and Postretirement Benefit Costs	(68.0		)	(67.4		)	(12.7		)
Total	$	428.4		$	100.4		$	440.4

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

A reconciliation of the income tax expense (benefit) attributable to income from operations before income tax, computed at U.S. federal statutory tax rates, to the income tax expense (benefit) as included in our consolidated statements of income, is as follows. Certain prior year amounts have been reclassified to conform to current year reporting.

	Year Ended December 31
	2012		2011		2010
Statutory Income Tax	35.0	%	35.0	%	35.0	%
Prior Year Taxes	(0.9	)	(11.0	)	0.4
Foreign Items	(2.0	)	(0.3	)	(1.3	)
Tax Credits	(2.7	)	(5.9	)	(0.6	)
Other Items, Net	(1.0	)	(3.1	)	(0.1	)
Effective Tax	28.4	%	14.7	%	33.4	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

Our deferred income tax asset and liability consists of the following:

	December 31
	2012		2011
	(in millions of dollars)
Deferred Tax Liability
Deferred Acquisition Costs	$	62.8	$	35.6
Unrealized Gains and Losses	643.9		512.7
Other	252.0		138.2
Gross Deferred Tax Liability	958.7		686.5
Deferred Tax Asset
Invested Assets	373.5		349.8
Employee Benefits	315.2		262.3
Other	0.6		29.7
Gross Deferred Tax Asset	689.3		641.8
Total Net Deferred Tax Liability	$	269.4	$	44.7

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

Our consolidated statements of income include amounts subject to both domestic and foreign taxation. The income and related tax expense (benefit) are as follows:

	Year Ended December 31
	2012			2011			2010
	(in millions of dollars)
Income Before Tax
United States - Federal	$	1,128.4		$	160.5		$	1,113.1
Foreign	121.1			172.8			206.8
Total	$	1,249.5		$	333.3		$	1,319.9
Current Tax Expense
United States - Federal	$	164.4		$	218.4		$	246.9
Foreign	42.2			12.1			54.1
Total	206.6			230.5			301.0
Deferred Tax Expense (Benefit)
United States - Federal	173.5			(203.4		)	144.5
Foreign	(25.0		)	22.0			(4.3		)
Total	148.5			(181.4		)	140.2
Total	$	355.1		$	49.1		$	441.2

Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block]

Our consolidated statements of income include the following changes in unrecognized tax benefits:

	December 31
	2012			2011			2010
	(in millions of dollars)
Balance at Beginning of Year	$	86.9		$	138.9		$	146.8
Tax Positions Taken During Prior Years
Additions	13.3			4.4			3.6
Subtractions	(0.6		)	(11.8		)	(11.5		)
Settlements with Tax Authorities	(23.5		)	(44.6		)	—
Lapses of Statute of Limitations	(61.1		)	—			—
Tax Positions Taken During Current Year	2.5			—			—
Balance at End of Year	17.5			86.9			138.9
Less Tax Attributable to Temporary Items Included Above	(15.0		)	(86.9		)	(123.7		)
Total Unrecognized Tax Benefits that if Recognized Would Affect the Effective Tax Rate	$	2.5		$	—		$	15.2