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Segment Information (Tables)
 12 Months Ended
Dec. 31, 2014
Segment Reporting Information, Additional Information [Abstract]  
Segment information
Presented below are segment data for the three years ended December 31, 2014, 2013 and 2012.
2014
 
Western Region
Operations 
 
Government
Contracts
 
Corporate/Other/
Eliminations 
 
Total
 
(Dollars in millions)
Revenues from external sources
$
13,361.2

 
$
604.0

 
$
—

 
$
13,965.2

Intersegment revenues
12.4

 
—

 
(12.4
)
 
—

Net investment income
45.2

 
—

 
—

 
45.2

Administrative services fees and other income
(1.7
)
 
—

 
—

 
(1.7
)
Interest expense
31.4

 
—

 
—

 
31.4

Depreciation and amortization
29.7

 
—

 
0.1

 
29.8

Share-based compensation expense
25.0

 
3.3

 
—

 
28.3

Segment pretax income (loss)
315.6

 
69.5

 
(185.3
)
 
199.8

2013 
 
Western Region
Operations 
 
Government
Contracts  
 
Corporate/Other/
Eliminations 
 
Total 
 
(Dollars in millions)
Revenues from external sources
$
10,377.1

 
$
572.3

 
$
—

 
$
10,949.4

Intersegment revenues
11.1

 
—

 
(11.1
)
 
—

Net investment income
69.6

 
—

 
—

 
69.6

Administrative services fees and other income
34.8

 
—

 
—

 
34.8

Interest expense
32.6

 
—

 
—

 
32.6

Depreciation and amortization
38.6

 
—

 
—

 
38.6

Share-based compensation expense
26.1

 
3.8

 
—

 
29.9

Segment pretax income (loss)
207.5

 
74.5

 
(12.0
)
 
270.0

 2012
 
Western Region
Operations 
 
Government
Contracts 
 
Divested Operations and Services 
 
Corporate/Other/
Eliminations 
 
Total 
 
(Dollars in millions)
Revenues from external sources
$
10,459.1

 
$
689.1

 
$
—

 
$
—

 
$
11,148.2

Intersegment revenues
11.0

 
—

 
—

 
(11.0
)
 
—

Net investment income
82.4

 
—

 
—

 
—

 
82.4

Administrative services fees and other income
18.0

 
—

 
—

 
—

 
18.0

Divested operations and services revenue
—

 
—

 
40.5

 
—

 
40.5

Interest expense
33.2

 
—

 
—

 
—

 
33.2

Depreciation and amortization
31.1

 
—

 
—

 
—

 
31.1

Share-based compensation expense
24.1

 
4.2

 
0.6

 
—

 
28.9

Segment pretax income (loss)
29.2

 
89.9

 
(45.4
)
 
(42.0
)
 
31.7
Premium revenue by line of business
Our health plan services premium revenue by line of business is as follows:
 
Year Ended December 31,
 
2014
 
2013
 
2012
 
(Dollars in millions)
Commercial premium revenue
$
5,443.1

 
$
5,175.4

 
5,705.5

Medicare premium revenue
3,044.3

 
2,771.4

 
2,790.5

Medicaid premium revenue
4,755.9

 
2,430.3

 
1,963.1

Dual Eligibles premium revenue
117.9

 
—

 
—

Total health plan services premiums
$
13,361.2

 
$
10,377.1

 
$
10,459.1