Reinsurance

12 Months Ended

Dec. 31, 2013

Reinsurance Disclosures [Abstract]

Reinsurance

Reinsurance

We reinsure certain risks with other companies and assume risk from other companies. We remain primarily liable to policyholders under ceded insurance contracts and are contingently liable for amounts recoverable from reinsurers in the event that such reinsurers do not meet their contractual obligations.

We evaluate the financial condition of our reinsurers and monitor concentrations of credit risk arising from similar geographic regions, activities, or economic characteristics of the reinsurers to minimize our exposure to significant losses from reinsurer insolvencies.

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		%

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

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

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