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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2013
Segment Reporting Information, Additional Information [Abstract]  
Segment Information
Our segment information for the three and nine months ended September 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 September 30, 2013
 
 
 
 
 
 
 
 
 
Revenues from external sources
$
2,625.7

 
$
149.3

 
$
—

 
$
—

 
$
2,775.0

Intersegment revenues
2.7

 
—

 
—

 
(2.7
)
 
—

Segment pretax income (loss)
85.2

 
23.5

 
—

 
(0.1
)
 
108.6

Three months ended September 30, 2012
 
 
 
 
 
 
 
 
 
Revenues from external sources
$
2,596.9

 
$
169.8

 
$
12.9

 
$
—

 
$
2,779.6

Intersegment revenues
2.7

 
—

 
—

 
(2.7
)
 
—

Segment pretax income (loss)
20.2

 
21.1

 
(4.7
)
 
(7.2
)
 
29.4

Nine months ended September 30, 2013
 
 
 
 
 
 
 
 
 
Revenues from external sources
$
7,886.7

 
$
423.8

 
$
—

 
$
—

 
$
8,310.5

Intersegment revenues
8.4

 
—

 
—

 
(8.4
)
 
—

Segment pretax income (loss)
204.3

 
50.6

 
—

 
(13.0
)
 
241.9

Nine months ended September 30, 2012
 
 
 
 
 
 
 
 
 
Revenues from external sources
$
7,898.2

 
$
527.4

 
$
25.7

 
$
—

 
$
8,451.3

Intersegment revenues
8.3

 
—

 
—

 
(8.3
)
 
—

Segment pretax income (loss)
12.6

 
66.6

 
(34.4
)
 
(21.6
)
 
23.2
Premium Revenue by Line of Business
Our health plan services premium revenue by line of business is as follows:
 
Three months ended September 30,
 
Nine months ended September 30,
 
2013
 
2012
 
2013
 
2012
 
(Dollars in millions)
Commercial premium revenue
$
1,279.8

 
$
1,420.4

 
$
3,903.8

 
$
4,310.0

Medicare premium revenue
685.4

 
682.9

 
2,080.3

 
2,089.4

Medicaid premium revenue
641.6

 
475.4

 
1,833.6

 
1,419.2

Total health plan services premiums
$
2,606.8

 
$
2,578.7

 
$
7,817.7

 
$
7,818.6