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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2015
Segment Reporting Information, Additional Information [Abstract]  
Segment Information
Our segment information for the three and six months ended June 30, 2015 and 2014 are as follows:
 
Western Region
Operations 
 
Government
Contracts
 
Corporate/Other/
Eliminations 
 
Total
 
(Dollars in millions)
Three months ended June 30, 2015
 
 
 
 
 
 
 
Revenues from external sources
$
4,022.6

 
$
141.0

 
$
—

 
$
4,163.6

Intersegment revenues
3.4

 
—

 
(3.4
)
 
—

Segment pretax income (loss)
154.7

 
3.8

 
(26.4
)
 
132.1

Segment net income (loss)
72.4

 
2.2

 
(16.2
)
 
58.4

Three months ended June 30, 2014
 
 
 
 
 
 
 
Revenues from external sources
$
3,267.3

 
$
154.1

 
$
—

 
$
3,421.4

Intersegment revenues
3.1

 
—

 
(3.1
)
 
—

Segment pretax income (loss)
80.7

 
21.4

 
(3.3
)
 
98.8

Segment net income (loss)
37.8

 
12.5

 
70.6

 
120.9

Six months ended June 30, 2015
 
 
 
 
 
 
 
Revenues from external sources
$
7,757.8

 
$
295.7

 
$
—

 
$
8,053.5

Intersegment revenues
6.8

 
—

 
(6.8
)
 
—

Segment pretax income (loss)
256.7

 
16.8

 
(73.7
)
 
199.8

Segment net income (loss)
123.1

 
9.8

 
(44.5
)
 
88.4

Six months ended June 30, 2014
 
 
 
 
 
 
 
Revenues from external sources
$
6,162.1

 
$
298.2

 
$
—

 
$
6,460.3

Intersegment revenues
6.1

 
—

 
(6.1
)
 
—

Segment pretax income (loss)
133.7

 
34.5

 
(7.4
)
 
160.8

Segment net income (loss)
61.4

 
20.1

 
68.1

 
149.6
Premium Revenue by Line of Business
Our health plan services premium revenue by line of business for the three and six months ended June 30, 2015 and 2014 are as follows:
 
Three months ended June 30,
 
Six months ended June 30,
 
2015
 
2014
 
2015
 
2014
 
(Dollars in millions)
Commercial premium revenue
$
1,412.9

 
$
1,377.5

 
$
2,745.9

 
$
2,641.6

Medicare premium revenue
782.4

 
757.2

 
1,551.3

 
1,512.4

Medicaid premium revenue
1,673.1

 
1,121.9

 
3,144.4

 
1,983.9

Dual Eligibles premium revenue
135.0

 
5.3

 
282.6

 
5.3

Total health plan services premiums
$
4,003.4

 
$
3,261.9

 
$
7,724.2

 
$
6,143.2