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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2014
Segment Reporting Information, Additional Information [Abstract]  
Segment Information
Our segment information for the three and six months ended June 30, 2014 and 2013 is as follows:
 
Western Region
Operations 
 
Government
Contracts
 
Corporate/Other/
Eliminations 
 
Total
 
(Dollars in millions)
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

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

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

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
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,
 
2014
 
2013
 
2014
 
2013
 
(Dollars in millions)
Commercial premium revenue
$
1,377.5

 
$
1,298.6

 
$
2,641.6

 
$
2,624.0

Medicare premium revenue
757.2

 
688.6

 
1,512.4

 
1,395.0

Medicaid premium revenue
1,121.9

 
591.7

 
1,983.9

 
1,191.9

Dual Eligibles premium revenue
5.3

 
—

 
5.3

 
—

Total health plan services premiums
$
3,261.9

 
$
2,578.9

 
$
6,143.2

 
$
5,210.9