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Segment Information (Tables)
 3 Months Ended
Mar. 31, 2015
Segment Reporting Information, Additional Information [Abstract]  
Segment Information
Our segment information for the three months ended March 31, 2015 and 2014 are as follows:
 
Western Region
Operations 
 
Government
Contracts
 
Corporate/Other/
Eliminations 
 
Total
 
(Dollars in millions)
Three months ended March 31, 2015
 
 
 
 
 
 
 
Revenues from external sources
$
3,735.2

 
$
154.7

 
$
—

 
$
3,889.9

Intersegment revenues
3.4

 
—

 
(3.4
)
 
—

Segment pretax income (loss)
102.0

 
13.0

 
(47.3
)
 
67.7

Segment net income (loss)
50.7

 
7.6

 
(28.3
)
 
30.0

Three months ended March 31, 2014
 
 
 
 
 
 
 
Revenues from external sources
$
2,894.8

 
$
144.1

 
$
—

 
$
3,038.9

Intersegment revenues
3.0

 
—

 
(3.0
)
 
—

Segment pretax income (loss)
53.0

 
13.0

 
(4.0
)
 
62.0

Segment net income (loss)
23.6

 
7.6

 
(2.4
)
 
28.8
Premium Revenue by Line of Business
Our health plan services premium revenue by line of business for the three months ended March 31, 2015 and 2014 are as follows:
 
Three months ended March 31,
 
2015
 
2014
 
(Dollars in millions)
Commercial premium revenue
$
1,333.0

 
$
1,264.2

Medicare premium revenue
768.9

 
755.2

Medicaid premium revenue
1,471.3

 
862.0

Dual Eligibles premium revenue
147.6

 
—

Total health plan services premiums
$
3,720.8

 
$
2,881.4