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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2013
Segment Reporting Information, Additional Information [Abstract]  
Segment Information
Our segment information for the three months ended March 31, 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 March 31, 2013
 
 
 
 
 
 
 
 
 
Revenues from external sources
$
2,662.5

 
$
134.5

 
$
—

 
$
—

 
$
2,797.0

Intersegment revenues
2.9

 
—

 
—

 
(2.9
)
 
—

Segment pretax income (loss)
72.3

 
9.0

 
—

 
—

 
81.3

Three Months Ended March 31, 2012
 
 
 
 
 
 
 
 
 
Revenues from external sources
$
2,649.0

 
$
181.4

 
$
—

 
$
—

 
$
2,830.4

Intersegment revenues
2.9

 
—

 
—

 
(2.9
)
 
—

Segment pretax income (loss)
(8.8
)
 
22.0

 
(23.2
)
 
(3.6
)
 
(13.6
)
Premium Revenue by Line of Business
Our health plan services premium revenue by line of business is as follows:
 
Three Months Ended March 31,
 
2013
 
2012
 
(Dollars in millions)
Commercial premium revenue
$
1,325.4

 
$
1,453.2

Medicare premium revenue
706.4

 
715.0

Medicaid premium revenue
600.3

 
452.7

Total health plan services premiums
$
2,632.1

 
$
2,620.9