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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2013
Segment Reporting Information, Additional Information [Abstract]  
Segment Information
Our segment information for the three and six months ended June 30, 2013 and 2012 is as follows:
 
Western Region
Operations 
 
Government
Contracts
 
Divested Operations and Services
 
Corporate/Other/
Eliminations 
 
Total
 
(Dollars in millions)
Three months ended June 30, 2013
 
 
 
 
 
 
 
 
 
Revenues from external sources
$
2,598.5

 
$
139.9

 
$
—

 
$
—

 
$
2,738.4

Intersegment revenues
2.8

 
—

 
—

 
(2.8
)
 
—

Segment pretax income (loss)
46.8

 
18.1

 
—

 
(12.9
)
 
52.0

Three months ended June 30, 2012
 
 
 
 
 
 
 
 
 
Revenues from external sources
$
2,652.3

 
$
176.2

 
$
12.8

 
$
—

 
$
2,841.3

Intersegment revenues
2.7

 
—

 
—

 
(2.7
)
 
—

Segment pretax income (loss)
1.2

 
23.5

 
(6.5
)
 
(10.8
)
 
7.4

Six months ended June 30, 2013
 
 
 
 
 
 
 
 
 
Revenues from external sources
$
5,261.0

 
$
274.5

 
$
—

 
$
—

 
$
5,535.5

Intersegment revenues
5.7

 
—

 
—

 
(5.7
)
 
—

Segment pretax income (loss)
119.1

 
27.1

 
—

 
(12.9
)
 
133.3

Six months ended June 30, 2012
 
 
 
 
 
 
 
 
 
Revenues from external sources
$
5,301.3

 
$
357.6

 
$
12.8

 
$
—

 
$
5,671.7

Intersegment revenues
5.6

 
—

 
—

 
(5.6
)
 
—

Segment pretax income (loss)
(7.6
)
 
45.5

 
(29.7
)
 
(14.4
)
 
(6.2
)
Premium Revenue by Line of Business
Our health plan services premium revenue by line of business is as follows:
 
Three months ended June 30,
 
Six months ended June 30,
 
2013
 
2012
 
2013
 
2012
 
(Dollars in millions)
Commercial premium revenue
$
1,298.6

 
$
1,436.5

 
$
2,624.0

 
$
2,889.7

Medicare premium revenue
688.6

 
691.4

 
1,395.0

 
1,406.5

Medicaid premium revenue
591.7

 
491.0

 
1,191.9

 
943.7

Total health plan services premiums
$
2,578.9

 
$
2,618.9

 
$
5,210.9

 
$
5,239.9