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Notes Payable (Tables)
 12 Months Ended
Dec. 31, 2013
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
Total amortized cost of debt outstanding at December 31, 2013 and 2012 was:
DOLLARS IN MILLIONS
 
2013
 
2012
Senior Notes:
 
 
 
 
6.00% Senior Notes due May 15, 2017
 
$
357.9

 
$
357.3

6.00% Senior Notes due November 30, 2015
 
249.0

 
248.6

Mortgage Note Payable due September 1, 2013
 
—

 
5.5

Total Notes Payable
 
$
606.9

 
$
611.4
Schedule of Interest Expense
Interest Expense, including facility fees, accretion of discount and write-off of unamortized credit agreement issuance costs for the years ended December 31, 2013, 2012 and 2011 was:
DOLLARS IN MILLIONS
 
2013
 
2012
 
2011
Notes Payable under Revolving Credit Agreement
 
$
1.4

 
$
1.9

 
$
2.0

Senior Notes Payable:
 
 
 
 
 
 
6.00% Senior Notes due May 15, 2017
 
22.2

 
22.1

 
22.0

6.00% Senior Notes due November 30, 2015
 
15.4

 
15.4

 
15.4

Mortgage Note Payable
 
0.2

 
0.4

 
0.4

Interest Expense before Capitalization of Interest
 
39.2

 
39.8

 
39.8

Capitalization of Interest
 
(0.9
)
 
(1.8
)
 
(2.5
)
Total Interest Expense
 
$
38.3

 
$
38.0

 
$
37.3
Schedule of Interest Paid
Interest Paid on Notes Payable, including facility fees, for the years ended December 31, 2013, 2012 and 2011 was:
DOLLARS IN MILLIONS
 
2013
 
2012
 
2011
Notes Payable under Revolving Credit Agreement
 
$
0.8

 
$
2.3

 
$
1.2

Senior Notes Payable:
 
 
 
 
 
 
6.00% Senior Notes due May 15, 2017
 
21.6

 
21.6

 
21.6

6.00% Senior Notes due November 30, 2015
 
15.0

 
15.0

 
15.2

Mortgage Note Payable
 
0.3

 
0.4

 
0.4

Total Interest Paid
 
$
37.7

 
$
39.3

 
$
38.4