Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Summary of Significant Accounting Policies [Abstract]

Carrying Amount Of Goodwill

The carrying amount of goodwill by reporting unit is as follows:

	Western Region Operations			Total
	(Dollars in millions)
Balance as of December 31, 2010	$	605.9		$	605.9
Balance as of December 31, 2011	605.9			605.9
Goodwill allocated to Medicare PDP business sold	(40.0		)	(40.0		)
Balance as of December 31, 2012	$	565.9		$	565.9

Schedule Of Intangible Assets

The intangible assets that continue to be subject to amortization using the straight-line method over their estimated lives are as follows:

	Gross Carrying Amount		Accumulated Amortization			Net Balance		Weighted Average Life (in years)
	(Dollars in millions)
As of December 31, 2012:
Provider networks	$	40.5	$	(34.6	)	$	5.9	19.4
Customer relationships and other	29.5		(18.1		)	11.4		11.1
	$	70.0	$	(52.7	)	$	17.3
As of December 31, 2011:
Provider networks	$	40.5	$	(33.6	)	$	6.9	19.4
Customer relationships and other	29.5		(15.7		)	13.8		11.1
	$	70.0	$	(49.3	)	$	20.7

Estimated Annual Pretax Amortization Expense For Other Intangible Assets

Estimated annual pretax amortization expense for other intangible assets for each of the next five years ending December 31 is as follows (dollars in millions):

Year	Amount
2013	$	3.4
2014	2.8
2015	2.6
2016	2.0
2017	2.0

Accumulated Other Comprehensive (Loss) Income

Our accumulated other comprehensive income (loss) for the years ended December 31, 2012, 2011 and 2010 is as follows:

	Unrealized Gains (Losses) on investments available-for-sale		Defined Benefit Pension Plans			Accumulated Other Comprehensive Income (loss)
			(Dollars in millions)
Balance as of January 1, 2010	$	1.0	$	(0.9	)	$	0.1
Other comprehensive income (loss) for the year ended December 31, 2010	4.3		(3.9		)	0.4
Balance as of January 1, 2011	$	5.3	$	(4.8	)	$	0.5
Other comprehensive income (loss) for the year ended December 31, 2011	24.5		(8.4		)	16.1
Balance as of January 1, 2012	$	29.8	$	(13.2	)	16.6
Other comprehensive (loss) income for the year ended December 31, 2012	8.2		2.2			10.4
Balance as of December 31, 2012	$	38.0	$	(11.0	)	$	27.0