Unaudited Quarterly Results (Tables)

12 Months Ended

Dec. 31, 2011

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

The following is a summary of our unaudited quarterly results of operations for 2011 and 2010:

	2011
	4th			3rd			2nd			1st
	(in millions of dollars, except share data)
Premium Income	$	1,888.5		$	1,881.2		$	1,875.0		$	1,869.5
Net Investment Income	634.6			629.2			637.1			618.7
Net Realized Investment Gain (Loss)	7.4			(23.9		)	(3.6		)	15.2
Total Revenue	2,604.8			2,545.6			2,564.5			2,563.1
Income (Loss) Before Income Tax	(704.3		)	293.3			338.0			330.2
Net Income (Loss)	(425.4		)	205.6			229.8			225.4
Net Income (Loss) Per Common Share
Basic	(1.45		)	0.69			0.75			0.72
Assuming Dilution	(1.45		)	0.69			0.75			0.72

	2010
	4th		3rd		2nd			1st
	(in millions of dollars, except share data)
Premium Income	$	1,868.2	$	1,850.2	$	1,849.8		$	1,863.2
Net Investment Income	634.3		618.4		629.8			613.0
Net Realized Investment Gain (Loss)	27.5		1.1		(29.5		)	25.6
Total Revenue	2,593.1		2,527.9		2,510.6			2,561.6
Income Before Income Tax	335.5		326.5		308.1			361.2
Net Income	225.8		220.8		209.7			229.8
Net Income Per Common Share
Basic	0.71		0.68		0.63			0.69
Assuming Dilution	0.71		0.68		0.63			0.69