Notes Payable (Tables)

12 Months Ended

Dec. 31, 2012

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]

Total debt outstanding at December 31, 2012 and 2011 was:

DOLLARS IN MILLIONS	2012		2011
Senior Notes at Amortized Cost:
6.00% Senior Notes due May 15, 2017	$	357.3	$	356.8
6.00% Senior Notes due November 30, 2015	248.6		248.2
Mortgage Note Payable at Amortized Cost	5.5		5.6
Notes Payable at Amortized Cost	$	611.4	$	610.6

Schedule of Interest Expense [Table Text Block]

Interest Expense, including facility fees, accretion of discount and write-off of unamortized credit agreement issuance costs for the years ended December 31, 2012, 2011 and 2010 was:

DOLLARS IN MILLIONS	2012			2011			2010
Notes Payable under Revolving Credit Agreement	$	1.9		$	2.0		$	2.0
Senior Notes Payable:
6.00% Senior Notes due May 15, 2017	22.1			22.0			22.0
6.00% Senior Notes due November 30, 2015	15.4			15.4			1.6
4.875% Senior Notes due November 1, 2010	—			—			8.4
Mortgage Note Payable	0.4			0.4			0.4
Interest Expense before Capitalization of Interest	39.8			39.8			34.4
Capitalization of Interest	(1.8		)	(2.5		)	(1.8		)
Total Interest Expense	$	38.0		$	37.3		$	32.6

Schedule of Interest Paid [Table Text Block]

Interest Paid on Notes Payable, including facility fees, for the years ended December 31, 2012, 2011 and 2010 was:

DOLLARS IN MILLIONS	2012		2011		2010
Notes Payable under Revolving Credit Agreement	$	2.3	$	1.2	$	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		15.2		—
4.875% Senior Notes due November 1, 2010	—		—		9.8
Mortgage Note Payable	0.4		0.4		0.4
Total Interest Paid	$	39.3	$	38.4	$	33.0