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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2015
Health Care Organization, Receivable and Revenue Disclosures [Line Items]  
Schedule of Goodwill
The carrying amount of goodwill by reporting unit is as follows:
 
Western
Region
Operations 
 
Total
 
(Dollars in millions)
Balance as of December 31, 2013
$
565.9

 
$
565.9

Goodwill allocated to sale of business (see Note 3)
(7.0
)
 
(7.0
)
Balance as of December 31, 2014
$
558.9

 
558.9

Balance as of December 31, 2015
$
558.9

 
$
558.9
Schedule of Acquired Finite-Lived Intangible Assets by Major Class
The intangible assets that continue to be subject to amortization using the straight-line method over their estimated lives are as follows:
 
Gross
Carrying
Amount  
 
Accumulated
Amortization  
 
Net
Balance  
 
Weighted
Average Life
(in years)  
 
(Dollars in millions)
 
 
As of December 31, 2015:
 
 
 
 
 
 
 
Provider networks
$
41.5

 
$
(38.0
)
 
$
3.5

 
18.9
Customer relationships and other
29.5

 
(23.9
)
 
5.6

 
11.1
 
$
71.0

 
$
(61.9
)
 
$
9.1

 
 
 
 
 
 
 
 
 
 
As of December 31, 2014:
 
 
 
 
 
 
 
Provider networks
$
41.5

 
$
(36.9
)
 
$
4.6

 
18.9
Customer relationships and other
29.5

 
(22.3
)
 
7.2

 
11.1
 
$
71.0

 
$
(59.2
)
 
$
11.8

 
 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
 Estimated annual pretax amortization expense for other intangible assets for each of the next five years ending December 31 is as follows (dollars in millions):  
Year
Amount
2016
$
2.2

2017
2.2

2018
2.1

2019
0.9

2020
0.6
Schedule of Accumulated Other Comprehensive Income (Loss)
Our accumulated other comprehensive income (loss) for the years ended December 31, 2015, 2014 and 2013 is as follows:
 
Unrealized Gains (Losses) on investments available-for-sale
 
Defined Benefit Pension Plans
 
Accumulated Other Comprehensive Income (loss)
 
 
 
(Dollars in millions)
 
 
Balance as of January 1, 2013
$
38.0

 
$
(11.0
)
 
$
27.0

Other comprehensive (loss) income before reclassifications
(50.7
)
 
4.8

 
(45.9
)
Amounts reclassified from accumulated other comprehensive income
(15.6
)
 
1.6

 
(14.0
)
Other comprehensive (loss) income for the year ended December 31, 2013
(66.3
)
 
6.4

 
(59.9
)
Balance as of January 1, 2014
$
(28.3
)
 
$
(4.6
)
 
$
(32.9
)
Other comprehensive income (loss) before reclassifications
38.3

 
(7.3
)
 
31.0

Amounts reclassified from accumulated other comprehensive income
(1.8
)
 
0.4

 
(1.4
)
Other comprehensive income (loss) for the year ended December 31, 2014
36.5

 
(6.9
)
 
29.6

Balance as of January 1, 2015
$
8.2

 
$
(11.5
)
 
$
(3.3
)
Other comprehensive (loss) income before reclassifications
(6.8
)
 
3.9

 
(2.9
)
Amounts reclassified from accumulated other comprehensive income
(0.1
)
 
1.6

 
1.5

Other comprehensive (loss) income for the year ended December 31, 2015
(6.9
)
 
5.5

 
(1.4
)
Balance as of December 31, 2015
$
1.3

 
$
(6.0
)
 
$
(4.7
)
Reclassification out of Accumulated Other Comprehensive Income
The following table shows reclassifications out of accumulated other comprehensive income and the affected line items in the consolidated statements of operations for the years ended December 31, 2015, 2014 and 2013:
 
Year Ended December 31,
 
Affected line item in the Consolidated Statements of Operations
 
2015
 
2014
 
2013
 
 
 
(Dollars in millions)
 
 
Unrealized gains on investments available-for-sale
$
0.2

 
$
2.7

 
$
24.0

 
Net investment income
 
0.2

 
2.7

 
24.0

 
Total before tax
 
0.1

 
0.9

 
8.4

 
Tax expense
 
0.1

 
1.8

 
15.6

 
Net of tax
Amortization of defined benefit pension items:
 
 
 
 
 
 
 
      Prior-service cost
(0.4
)
 
(0.4
)
 
(0.1
)
 
(a)
 Actuarial gains (losses)
(2.2
)
 
(0.2
)
 
(2.5
)
 
(a)
 
(2.6
)
 
(0.6
)
 
(2.6
)
 
Total before tax
 
(1.0
)
 
(0.2
)
 
(1.0
)
 
Tax benefit
 
(1.6
)
 
(0.4
)
 
(1.6
)
 
Net of tax
 
 
 
 
 
 
 
 
Total reclassifications for the period
$
(1.5
)
 
$
1.4

 
$
14.0

 
Net of tax
_________
(a)
These accumulated other comprehensive income components are included in the computation of net periodic pension cost.
Schedule of ACA 3Rs Assets and Liabilities
The following table presents the assets and liabilities related to the 3Rs as of December 31, 2015 and December 31, 2014:
 
 
December 31, 2015
 
December 31, 2014
Other receivables:
 
(Dollars in millions)
Reinsurance
 
$
214.1

 
$
234.0

Risk adjustment
 
143.2

 
81.0

Risk corridor
 
1.8

 
—

 
 
 
 
 
Other noncurrent assets:
 
 
 
 
Risk corridor
 
212.5

 
90.4

 
 
 
 
 
Accounts payable and other liabilities:
 
 
 
 
Risk adjustment
 
187.2

 
153.4

 
 
 
 
 
Other noncurrent liabilities:
 
 
 
 
Risk corridor
 
—

 
3.6

 
 
 
 
 
Net Receivable (Payable) Balance:
 
 
 
 
Risk adjustment
 
$
(44.0
)
 
$
(72.4
)
Risk corridor
 
214.3

 
86.8

Reinsurance
 
214.1

 
234.0
Schedule of ACA 3Rs Estimates
The following table presents the changes in our balances related to the 3Rs during the years ended December 31, 2015 and 2014:
 
Net Receivable/(Payable) Balance as of
December 31, 2014 and 2013
 
Change in Estimates Related to Prior Year
 
Current Estimates
 
Payments Made (Received)
 
Net Receivable/(Payable) Balance as of
December 31, 2015 and 2014
 
 
 
(Dollars in millions)
 
 
 
 
2015
 
 
 
 
 
 
 
 
 
Risk adjustment
$
(72.4
)
 
$
(6.3
)
 
$
(49.6
)
 
$
84.3

 
$
(44.0
)
Risk corridor
86.8

 
11.3

 
126.8

 
(10.6
)
 
214.3

Reinsurance
234.0

 
(19.3
)
 
214.1

 
(214.7
)
 
214.1

2014
 
 
 
 
 
 
 
 
 
Risk adjustment
$
—

 
$
—

 
$
(72.4
)
 
$
—

 
$
(72.4
)
Risk corridor
—

 
—

 
86.8

 
—

 
86.8

Reinsurance
—

 
—

 
234.0

 
—

 
234.0
Schedule of Change in Accounting Estimate
The financial statement impact of the section 1202 reimbursement methodology change is summarized in the table below.
 
Recorded In
 
Year Ended December 31, 2013
 
Year Ended December 31, 2014
 
 
 
 
 
 
(Dollars in millions)
No Risk
 
No Risk
 
Full Risk
Health plan services premiums
$
4.4

 
$
—

 
$
154.7

Health plan services expenses
—

 
—

 
144.0

General and administrative expenses
4.4

 
—

 
—

Administrative services fees and other income
6.5

 
1.4

 
(7.9
)
Pretax income
$
6.5

 
$
1.4

 
$
2.8
Medicaid Premium Revenue [Member]  
Health Care Organization, Receivable and Revenue Disclosures [Line Items]  
Impact to Health Plan Service Premium Revenue
The following table presents information regarding the impact to health plan services premium revenues related to the Medi-Cal MLR rebates and our Arizona Medicaid contract profit-sharing provisions (amounts in millions):
 
Increase (Decrease) in Health Plan Services Premium Revenue
 
Year Ended December 31, 2015
 
2015
 
2014
Medi-Cal MLR rebates
$
(202.5
)
 
$
(200.6
)
AZ Medicaid contract profit-sharing provisions
(63.7
)
 
(24.7
)
Medicare and Medi-Cal [Member]  
Health Care Organization, Receivable and Revenue Disclosures [Line Items]  
Impact to Health Plan Service Premium Revenue
The following table presents information regarding the impact to health plan services premium revenues related to the change in prior years Medicare risk adjustment revenues, retroactive premium adjustments for our Medi-Cal and other state-sponsored health programs and the change in deficit calculated under our state-sponsored health plans rate settlement agreement (amounts in millions):
 
Increase (Decrease) in Health Plan Services Premium Revenue
 
Year Ended December 31,
 
2015
 
2014
 
2013
Change in prior years risk adjustment revenue estimate
$
1.1

 
$
13.1

 
$
(9.0
)
Medi-Cal retroactive premium adjustments for prior years
46.9

 
—

 
74.3

Change in deficit calculated under our state-sponsored health plans rate settlement agreement
—

 
(62.9
)
 
62.9