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Notes Payable (Tables)
 6 Months Ended
Jun. 30, 2013
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
Total debt outstanding at June 30, 2013 and December 31, 2012 was:
(Dollars in Millions)
 
Jun 30,
2013
 
Dec 31,
2012
Senior Notes at Amortized Cost:
 
 
 
 
6.00% Senior Notes due May 15, 2017
 
$
357.6

 
$
357.3

6.00% Senior Notes due November 30, 2015
 
248.8

 
248.6

Mortgage Note Payable at Amortized Cost
 
5.5

 
5.5

Notes Payable at Amortized Cost
 
$
611.9

 
$
611.4
Schedule of Interest Expense [Table Text Block]
Interest Expense, including facility fees, accretion of discount and write-off of unamortized issuance costs from the former credit agreement, for the six and three months ended June 30, 2013 and 2012 was:
 
 
Six Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Jun 30,
2013
 
Jun 30,
2012
 
Jun 30,
2013
 
Jun 30,
2012
Notes Payable under Revolving Credit Agreements
 
$
0.6

 
$
1.3

 
$
0.3

 
$
0.3

Senior Notes Payable:
 
 
 
 
 
 
 
 
6.00% Senior Notes due May 15, 2017
 
11.1

 
11.1

 
5.6

 
5.6

6.00% Senior Notes due November 30, 2015
 
7.7

 
7.7

 
3.8

 
3.8

Mortgage Note Payable
 
0.2

 
0.2

 
0.1

 
0.1

Interest Expense before Capitalization of Interest
 
19.6

 
20.3

 
9.8

 
9.8

Capitalization of Interest
 
(0.5
)
 
(1.4
)
 
(0.2
)
 
(0.6
)
Total Interest Expense
 
$
19.1

 
$
18.9

 
$
9.6

 
$
9.2
Schedule of Interest Paid [Table Text Block]
Interest paid, including facility fees and credit agreement issuance costs, for the six and three months ended June 30, 2013 and 2012 was:
 
 
Six Months Ended
 
Three Months Ended
(Dollars in Millions)
 
Jun 30,
2013
 
Jun 30,
2012
 
Jun 30,
2013
 
Jun 30,
2012
Notes Payable under Revolving Credit Agreements
 
$
0.2

 
$
1.7

 
$
0.2

 
$
—

Senior Notes Payable:
 
 
 
 
 
 
 
 
6.00% Senior Notes due May 15, 2017
 
10.8

 
10.8

 
10.8

 
10.8

6.00% Senior Notes due November 30, 2015
 
7.5

 
7.5

 
7.5

 
7.5

Mortgage Note Payable
 
0.2

 
0.2

 
0.1

 
0.1

Total Interest Paid
 
$
18.7

 
$
20.2

 
$
18.6

 
$
18.4