Reinsurance (Tables)

12 Months Ended

Dec. 31, 2013

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:

	2013						2012						2011
	Written			Earned			Written			Earned			Written			Earned
Direct	$	65,939.1		$	66,038.9		$	56,443.6		$	56,373.6		$	56,190.3		$	55,875.8
Assumed	174.3			174.0			197.0			196.4			179.9			178.5
Ceded	(92.6		)	(93.8		)	(73.2		)	(73.3		)	(84.2		)	(84.7		)
Net premiums	$	66,020.8		$	66,119.1		$	56,567.4		$	56,496.7		$	56,286.0		$	55,969.6
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 20, “Segment Information”) for the years ended December 31 is as follows:

	2013				2012				2011
	Written		Earned		Written		Earned		Written		Earned
Reportable segments:
Commercial and Specialty Business	$	35,126.0	$	35,159.8	$	35,352.1	$	35,251.9	$	36,476.3	$	36,436.7
Government Business	30,894.8		30,959.3		21,215.3		21,244.8		19,809.7		19,532.9
Other	—		—		—		—		—		—
Net premiums	$	66,020.8	$	66,119.1	$	56,567.4	$	56,496.7	$	56,286.0	$	55,969.6

Effect Of Reinsurance On Benefit Expense

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

	2013			2012			2011
Direct	$	56,185.2		$	48,135.1		$	47,569.8
Assumed	155.6			173.0			165.0
Ceded	(103.7		)	(94.5		)	(87.3		)
Net benefit expense	$	56,237.1		$	48,213.6		$	47,647.5

Effect Of Reinsurance On Certain Assets And Liabilities

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

	2013		2012
Policy liabilities, assumed	$	55.4	$	62.4
Unearned income, assumed	0.4		0.5
Premiums payable, ceded	17.1		18.1
Premiums receivable, assumed	14.1		16.6