Debt (Tables)

6 Months Ended

Jun. 30, 2014

Debt Disclosure [Abstract]

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

The amortized cost of debt outstanding at June 30, 2014 and December 31, 2013 was:

(Dollars in Millions)	Jun 30, 2014		Dec 31, 2013
Senior Notes:
6.00% Senior Notes due November 30, 2015	$	249.3	$	249.0
6.00% Senior Notes due May 15, 2017	358.2		357.9
7.375% Subordinated Debentures due February 27, 2054	144.2		—
Total Debt Outstanding	$	751.7	$	606.9

Schedule of Interest Expense [Table Text Block]

Interest Expense, including facility fees, accretion of discount and amortization of issuance costs, for the six and three months endedJune 30, 2014 and 2013 was:

	Six Months Ended						Three Months Ended
(Dollars in Millions)	Jun 30, 2014			Jun 30, 2013			Jun 30, 2014			Jun 30, 2013
Notes Payable under Revolving Credit Agreement	$	0.4		$	0.6		$	0.2		$	0.3
Senior Notes Payable:
6.00% Senior Notes due November 30, 2015	7.7			7.7			3.8			3.8
6.00% Senior Notes due May 15, 2017	11.1			11.1			5.6			5.6
7.375% Subordinated Debentures due February 27, 2054	3.8			—			2.8			—
Mortgage Note Payable	—			0.2			—			0.1
Interest Expense before Capitalization of Interest	23.0			19.6			12.4			9.8
Capitalization of Interest	(0.5		)	(0.5		)	(0.2		)	(0.2		)
Total Interest Expense	$	22.5		$	19.1		$	12.2		$	9.6

Schedule of Interest Paid [Table Text Block]

Interest paid, including facility fees, for the six and three months endedJune 30, 2014 and 2013 was:

	Six Months Ended				Three Months Ended
(Dollars in Millions)	Jun 30, 2014		Jun 30, 2013		Jun 30, 2014		Jun 30, 2013
Notes Payable under Revolving Credit Agreement	$	0.3	$	0.2	$	0.1	$	0.2
Senior Notes Payable:
6.00% Senior Notes due November 30, 2015	7.5		7.5		7.5		7.5
6.00% Senior Notes due May 15, 2017	10.8		10.8		10.8		10.8
7.375% Subordinated Debentures due February 27, 2054	2.8		—		2.8		—
Mortgage Note Payable	—		0.2		—		0.1
Total Interest Paid	$	21.4	$	18.7	$	21.2	$	18.6