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Senior Notes (Tables) (Senior Notes [Member])
3 Months Ended
Mar. 31, 2014
Senior Notes [Member]
 
Debt Instrument [Line Items]  
Schedule of Senior Notes
 
 
 
March 31, 2014
 
December 31, 2013
(Dollars in millions)
 
 
Unamortized
 
 
 
Unamortized
 
 
Interest Rate
Maturity Date
Face Value
Net Premium/(Discount)
Carrying Value
 
Face Value
Net Premium/(Discount)
Carrying Value
2042 Notes
7.75%
12/1/2042
$
55.0

$

$
55.0

 
$
55.0

$

$
55.0

2024 Notes
5.88%
4/1/2024
300.0

(2.8
)
297.2

 



2019 Notes
8.75%
4/1/2019
350.0

3.9

353.9

 
350.0

4.0

354.0

Senior Notes
 
 
$
705.0

$
1.1

$
706.1

 
$
405.0

$
4.0

$
409.0