Income Taxes (Tables)

12 Months Ended

Dec. 31, 2011

Income Taxes [Abstract]

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

Income tax expense consists of the following:

	Year Ended December 31,
(dollars in millions)	2011			2010			2009
Current:
Federal	$	—		$	0.3		$	2.5
State and local	0.4			0.7			1.5
Total current	0.4			1.0			4.0
Investment tax credits	(0.3		)	(0.3		)	(0.3		)
Deferred:
Federal	24.3			44.0			59.8
State and local	3.5			1.4			6.9
Total deferred	27.8			45.4			66.7
Valuation allowance	(2.9		)	(7.2		)	(5.7		)
Total	$	25.0		$	38.9		$	64.7

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

The following is a reconciliation of the statutory federal income tax rate with the effective tax rate for each year:

	Year Ended December 31,
	2011		2010		2009
U.S. federal statutory rate	35.0	%	35.0	%	35.0	%
State and local income taxes, net of federal income tax	2.9		2.6		1.3
Change in valuation allowance, net of federal income tax	(4.4	)	(7.1	)	(2.4	)
State net operating loss adjustments	2.7		0.1		2.3
Nondeductible interest expense	15.0		13.3		3.8
Medicare drug subsidy law change	—		5.8		—
Unrecognized tax benefit changes	2.8		5.7		0.8
Nondeductible compensation	2.1		1.5		0.1
Other differences, net	1.2		1.0		1.0
Effective tax rate	57.3	%	57.9	%	41.9	%

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

The components of our deferred tax assets and liabilities are as follows:

	December 31,
(dollars in millions)	2011			2010
Deferred tax assets:
Net operating loss carryforwards	$	453.9		$	445.8
Pension and postretirement benefits	155.0			134.6
Other	70.8			67.3
Total deferred tax assets	679.7			647.7
Valuation allowance	(58.4		)	(60.0		)
Total deferred tax assets, net of valuation allowance	$	621.3		587.7
Deferred tax liabilities:
Property, plant and equipment	$	159.8		127.9
Federal deferred liability on state deferred tax assets	7.8			8.0
Total deferred tax liabilities	167.6			135.9
Net deferred tax assets	$	453.7		$	451.8

Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block]

A reconciliation of the unrecognized tax benefits is as follows:

	Year Ended December 31,
(dollars in millions)	2011		2010			2009
Balance, beginning of year	$	20.5	$	16.7		$	15.6
Change in tax positions for the current year	1.3		4.0			1.1
Change in tax positions for prior years	—		(0.2		)	—
Balance, end of year	$	21.8	$	20.5		$	16.7