Reinsurance (Tables)

12 Months Ended

Dec. 31, 2014

Reinsurance Disclosures [Abstract]

Summary Of Direct, Assumed And Ceded Premiums Written And Earned

A summary of direct, assumed and ceded premiums written and earned for the years ended December 31 is as follows:

	2014						2013						2012
	Written			Earned			Written			Earned			Written			Earned
Direct	$	68,628.6		$	68,304.3		$	65,939.1		$	66,038.9		$	56,443.6		$	56,373.6
Assumed	192.3			194.0			174.3			174.0			197.0			196.4
Ceded	(108.5		)	(108.5		)	(92.6		)	(93.8		)	(73.2		)	(73.3		)
Net premiums	$	68,712.4		$	68,389.8		$	66,020.8		$	66,119.1		$	56,567.4		$	56,496.7
Percentage—assumed to net premiums	0.3		%	0.3		%	0.3		%	0.3		%	0.3		%	0.3		%

Summary Of Net Premiums Written And Earned By Segment

A summary of net premiums written and earned by segment (see Note 19, “Segment Information”) for the years ended December 31 is as follows:

	2014				2013				2012
	Written		Earned		Written		Earned		Written		Earned
Reportable segments:
Commercial and Specialty Business	$	35,084.7	$	35,045.2	$	35,733.9	$	35,772.0	$	35,358.1	$	36,036.7
Government Business	33,627.7		33,344.6		30,286.9		30,347.1		21,209.3		20,460.0
Other	—		—		—		—		—		—
Net premiums	$	68,712.4	$	68,389.8	$	66,020.8	$	66,119.1	$	56,567.4	$	56,496.7

Effect Of Reinsurance On Benefit Expense

The effect of reinsurance on benefit expense for the years ended December 31 is as follows:

	2014			2013			2012
Direct	$	57,496.6		$	56,185.2		$	48,135.1
Assumed	182.4			155.6			173.0
Ceded	(824.1		)	(103.7		)	(94.5		)
Net benefit expense	$	56,854.9		$	56,237.1		$	48,213.6

Effect Of Reinsurance On Certain Assets And Liabilities

The effect of reinsurance on certain assets and liabilities at December 31 is as follows:

	2014		2013
Policy liabilities, assumed	$	57.4	$	55.4
Unearned income, assumed	0.4		0.4
Premiums payable, ceded	7.7		17.1
Premiums receivable, assumed	5.4		14.1