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INVESTMENTS (TABLES)
 6 Months Ended
Jun. 30, 2013
Investments, Debt and Equity Securities [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
Accumulated other comprehensive income is primarily comprised of the net effect of unrealized appreciation (depreciation) on our investments.  These amounts, included in shareholders' equity as of June 30, 2013 and December 31, 2012, were as follows (dollars in millions):

 
June 30,
2013
 
December 31,
2012
Net unrealized appreciation (depreciation) on fixed maturity securities, available for sale, on which an other-than-temporary impairment loss has been recognized
$
7.5

 
$
9.8

Net unrealized gains on all other investments
1,602.1

 
2,986.5

Adjustment to present value of future profits (a)
(176.5
)
 
(193.0
)
Adjustment to deferred acquisition costs
(320.1
)
 
(452.9
)
Adjustment to insurance liabilities
(25.8
)
 
(489.8
)
Unrecognized net loss related to deferred compensation plan
(5.5
)
 
(7.9
)
Deferred income tax liabilities
(383.6
)
 
(655.3
)
Accumulated other comprehensive income
$
698.1

 
$
1,197.4

_________
(a)
The present value of future profits is the value assigned to the right to receive future cash flows from contracts existing at September 10, 2003 (the date our Predecessor emerged from bankruptcy).
Schedule of Available-for-sale Securities Reconciliation [Table Text Block]
At June 30, 2013, the amortized cost, gross unrealized gains and losses, estimated fair value, other-than-temporary impairments in accumulated other comprehensive income of fixed maturities, available for sale, were as follows (dollars in millions):
 
Amortized
cost
 
Gross
unrealized
gains
 
Gross
unrealized
losses
 
Estimated
fair value
 
Other-than-
temporary
impairments
included in
accumulated other
comprehensive
income
Corporate securities
$
14,952.8

 
$
1,294.4

 
$
(143.4
)
 
$
16,103.8

 
$
—

United States Treasury securities and obligations of United States government corporations and agencies
127.9

 
3.6

 
(.4
)
 
131.1

 
—

States and political subdivisions
1,945.0

 
162.8

 
(20.6
)
 
2,087.2

 
—

Asset-backed securities
1,389.0

 
79.1

 
(12.7
)
 
1,455.4

 
—

Collateralized debt obligations
319.4

 
9.2

 
(.8
)
 
327.8

 
—

Commercial mortgage-backed securities
1,302.6

 
101.8

 
(6.7
)
 
1,397.7

 
—

Mortgage pass-through securities
14.8

 
.8

 
—

 
15.6

 
—

Collateralized mortgage obligations
1,972.2

 
135.0

 
(2.8
)
 
2,104.4

 
(4.8
)
Total fixed maturities, available for sale
$
22,023.7

 
$
1,786.7

 
$
(187.4
)
 
$
23,623.0

 
$
(4.8
)
Investments Classified by Contractual Maturity Date [Table Text Block]
The following table sets forth the amortized cost and estimated fair value of fixed maturities, available for sale, at June 30, 2013, by contractual maturity.  Actual maturities will differ from contractual maturities because certain borrowers may have the right to call or prepay obligations with or without penalties.  In addition, structured securities (such as asset-backed securities, collateralized debt obligations, commercial mortgage-backed securities, mortgage pass-through securities and collateralized mortgage obligations, collectively referred to as "structured securities") frequently include provisions for periodic principal payments and permit periodic unscheduled payments.
 
Amortized
cost
 
Estimated
fair
value
 
(Dollars in millions)
Due in one year or less
$
246.1

 
$
250.1

Due after one year through five years
1,823.0

 
1,974.9

Due after five years through ten years
4,131.4

 
4,468.3

Due after ten years
10,825.2

 
11,628.8

Subtotal
17,025.7

 
18,322.1

Structured securities
4,998.0

 
5,300.9

Total fixed maturities, available for sale
$
22,023.7

 
$
23,623.0
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table Text Block]
The following table summarizes the amount of credit losses recognized in earnings on fixed maturity securities, available for sale, held at the beginning of the period, for which a portion of the other-than-temporary impairment was also recognized in accumulated other comprehensive income for the three and six months ended June 30, 2013 and 2012 (dollars in millions):
 
Three months ended
 
Six months ended
 
June 30,
 
June 30,
 
2013
 
2012
 
2013
 
2012
Credit losses on fixed maturity securities, available for sale, beginning of period
$
(1.5
)
 
$
(1.9
)
 
$
(1.6
)
 
$
(2.0
)
Add:  credit losses on other-than-temporary impairments not previously recognized
—

 
—

 
—

 
—

Less:  credit losses on securities sold
—

 
.2

 
.1

 
.3

Less:  credit losses on securities impaired due to intent to sell (a)
—

 
—

 
—

 
—

Add:  credit losses on previously impaired securities
—

 
—

 
—

 
—

Less:  increases in cash flows expected on previously impaired securities
—

 
—

 
—

 
—

Credit losses on fixed maturity securities, available for sale, end of period
$
(1.5
)
 
$
(1.7
)
 
$
(1.5
)
 
$
(1.7
)
__________
(a)
Represents securities for which the amount previously recognized in accumulated other comprehensive income was recognized in earnings because we intend to sell the security or we more likely than not will be required to sell the security before recovery of its amortized cost basis.
Schedule of Unrealized Loss on Investments [Table Text Block]
The following table summarizes the gross unrealized losses and fair values of our investments with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by investment category and length of time that such securities have been in a continuous unrealized loss position, at June 30, 2013 (dollars in millions):

 
 
Less than 12 months
 
12 months or greater
 
Total
Description of securities
 
Fair
value
 
Unrealized
losses
 
Fair
value
 
Unrealized
losses
 
Fair
value
 
Unrealized
losses
United States Treasury securities and obligations of United States government corporations and agencies
 
$
24.0

 
$
(.4
)
 
$
—

 
$
—

 
$
24.0

 
$
(.4
)
States and political subdivisions
 
276.8

 
$
(14.0
)
 
63.4

 
(6.6
)
 
340.2

 
(20.6
)
Corporate securities
 
2,388.2

 
(135.5
)
 
71.7

 
(7.9
)
 
2,459.9

 
(143.4
)
Asset-backed securities
 
297.3

 
(10.6
)
 
42.5

 
(2.1
)
 
339.8

 
(12.7
)
Collateralized debt obligations
 
46.5

 
(.8
)
 
—

 
—

 
46.5

 
(.8
)
Commercial mortgage-backed securities
 
107.0

 
(6.4
)
 
3.3

 
(.3
)
 
110.3

 
(6.7
)
Mortgage pass-through securities
 
1.8

 
—

 
1.8

 
—

 
3.6

 
—

Collateralized mortgage obligations
 
151.2

 
(2.8
)
 
2.8

 
—

 
154.0

 
(2.8
)
Total fixed maturities, available for sale
 
$
3,292.8

 
$
(170.5
)
 
$
185.5

 
$
(16.9
)
 
$
3,478.3

 
$
(187.4
)
Equity securities
 
$
31.7

 
$
(1.3
)
 
$
—

 
$
—

 
$
31.7

 
$
(1.3
)
The following table summarizes the gross unrealized losses and fair values of our investments with unrealized losses that are not deemed to be other-than-temporarily impaired, aggregated by investment category and length of time that such securities have been in a continuous unrealized loss position, at December 31, 2012 (dollars in millions):

 
 
Less than 12 months
 
12 months or greater
 
Total
Description of securities
 
Fair
value
 
Unrealized
losses
 
Fair
value
 
Unrealized
losses
 
Fair
value
 
Unrealized
losses
States and political subdivisions
 
$
48.3

 
$
(1.8
)
 
68.7

 
$
(3.4
)
 
$
117.0

 
$
(5.2
)
Corporate securities
 
338.1

 
(11.2
)
 
174.5

 
(9.0
)
 
512.6

 
(20.2
)
Asset-backed securities
 
41.7

 
(.3
)
 
111.6

 
(4.9
)
 
153.3

 
(5.2
)
Collateralized debt obligations
 
19.4

 
(.4
)
 
32.5

 
(.6
)
 
51.9

 
(1.0
)
Commercial mortgage-backed securities
 
4.9

 
(.1
)
 
6.2

 
(.5
)
 
11.1

 
(.6
)
Mortgage pass-through securities
 
—

 
—

 
1.9

 
—

 
1.9

 
—

Collateralized mortgage obligations
 
27.0

 
(.4
)
 
33.8

 
(.3
)
 
60.8

 
(.7
)
Total fixed maturities, available for sale
 
$
479.4

 
$
(14.2
)
 
$
429.2

 
$
(18.7
)
 
$
908.6

 
$
(32.9
)
Equity securities
 
$
17.8

 
$
(1.6
)
 
$
—

 
$
—

 
$
17.8

 
$
(1.6
)