Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2012

Compensation and Retirement Disclosure [Abstract]

Schedule of Benefit Obligations and Fair Value of Plan Assets

The following table summarizes the benefit obligations, fair value of plan assets and funded status, for the SERPs and Agents Non-Qualified Plan, for the years ended December 31, 2012 and 2011.

	2012			2011
Change in benefit obligation:
Benefit obligation, January 1	$	98.7		$	96.8
Interest cost	4.4			5.0
Benefits paid	(9.3		)	(8.4		)
Actuarial gain on obligation	3.4			18.4
Plan adjustments	—			(8.8		)
Curtailments or settlements	—			(4.3		)
Benefit obligation, December 31	$	97.2		$	98.7
Fair Value of Plan Assets:
Fair value of plan assets, December 31	$	—		$	—

Schedule of Amounts Recognized in Consolidated Balance Sheets

Amounts recognized in the Consolidated Balance Sheets consist of:

	2012			2011
Accrued benefit cost	$	(97.2	)	$	(98.7	)
Accumulated other comprehensive income:
Prior service cost	(7.3		)	(8.5		)
Net amount recognized	$	(104.5	)	$	(107.2	)

Schedule of Weighted Average Assumptions Used

The weighted-average assumptions used in calculating the net pension cost were as follows:

	2012		2011		2010
Discount rate	4.75	%	5.50	%	6.00	%
Rate of increase in compensation levels	4.00	%	4.00	%	3.00	%

The weighted-average assumptions used in the measurement of the December 31, 2012 and 2011 benefit obligation for the SERPs and Agents Non-Qualified Plan, were as follows:

	2012		2011
Discount rate	4.05	%	4.75	%
Rate of compensation increase	4.00	%	4.00	%

Schedule of Net Periodic Benefit Costs

Net periodic benefit costs for the SERPs and Agents Non-Qualified Plan, for the years ended December 31, 2012, 2011 and 2010, were as follows:

	2012			2011		2010
Interest cost	$	4.4		$	5.0	$	5.1
Net loss (gain)	3.4			16.0		11.5
Unrecognized past service cost recognized in the year	(1.2		)	—		0.1
The effect of any curtailment or settlement	—			2.2		—
Net periodic benefit cost	$	6.6		$	23.2	$	16.7