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Fair Value Measurements (Tables)
12 Months Ended
Dec. 31, 2012
Fair Value Disclosures [Abstract]  
Fair Value, Measurement Inputs, Disclosure [Table Text Block]
Assets measured at fair value on a recurring basis as of December 31, 2012 and 2011 is summarized in the following tables.
 
Dollar amounts in millions
December 31,
2012
 
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)
 
Significant
Other Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Available for sale securities
$
2.0

 
$

 
$

 
$
2.0

Trading securities
1.7

 
1.7

 

 

Total
$
3.7

 
$
1.7

 
$

 
$
2.0

 
Dollar amounts in millions
December 31,
2011
 
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)
 
Significant
Other Observable
Inputs
(Level 2)
 
Significant
Unobservable
Inputs
(Level 3)
Available for sale securities
$
0.7

 
$

 
$

 
$
0.7

Trading securities
2.7

 
2.7

 

 

Total
$
3.4

 
$
2.7

 
$

 
$
0.7

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
The following table summarizes assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the periods ended December 31, 2012 and 2011. 
Dollar amounts in millions
Available for
sale securities
Balance at December 31, 2010
$
11.6

Sale of ARS
(19.7
)
Total realized/unrealized gains (losses)
 
Included in investment income
15.2

Included in other comprehensive income
(6.4
)
Balance at December 31, 2011
0.7

Sale of ARS

Total realized/unrealized gains (losses)
 
Included in investment income

Included in other comprehensive income
1.3

Balance at December 31, 2012
$
2.0

The amount of total losses for the period included in net loss attributable to the fair value of changes in assets still held at December 31, 2011
$

The amount of total losses for the period included in net loss attributable to the fair value of changes in assets still held at December 31, 2012
$

Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Table Text Block]