Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

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)	2012			2011			2010
Current:
Federal	$	1.8		$	—		$	0.3
State and local	1.6			0.4			0.7
Total current	3.4			0.4			1.0
Investment tax credits	(0.3		)	(0.3		)	(0.3		)
Deferred:
Federal	21.8			24.3			44.0
State and local	2.0			3.4			1.4
Foreign	(0.5		)	0.1			—
Total deferred	23.3			27.8			45.4
Valuation allowance	(1.7		)	(2.9		)	(7.2		)
Total	$	24.7		$	25.0		$	38.9

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,
	2012		2011		2010
U.S. federal statutory rate	35.0	%	35.0	%	35.0	%
State and local income taxes, net of federal income tax	3.9		2.9		2.6
Change in valuation allowance, net of federal income tax	(2.3	)	(4.4	)	(7.1	)
State net operating loss adjustments	3.7		2.7		0.1
Nondeductible interest expense	18.1		15.0		13.3
Medicare drug subsidy law change	—		—		5.8
Unrecognized tax benefit changes	2.2		2.8		5.7
Nondeductible compensation	2.7		2.1		1.5
Foreign	3.5		0.1		0.8
Other differences, net	2.0		1.1		0.2
Effective tax rate	68.8	%	57.3	%	57.9	%

Schedule of income tax provision charged to continuing operations, accumulated other comprehensive income/(loss) or additional paid-in capital [Table Text Block]

The income tax provision (benefit) was charged to continuing operations, accumulated other comprehensive income/ (loss) or additional paid-in capital as follows:

	Year Ended December 31,
(dollars in millions)	2012			2011			2010
Income tax provision (benefit) related to:
Continuing operations	$	24.7		$	25.0		$	38.9
Accumulated other comprehensive loss	(0.4		)	(26.5		)	(13.2		)
Excess tax benefits on stock option exercises	(2.4		)	—			—

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)	2012			2011
Deferred tax assets:
Net operating loss carryforwards	$	410.8		$	453.9
Pension and postretirement benefits	144.6			155.0
Other	69.9			70.8
Total deferred tax assets	625.3			679.7
Valuation allowance	(56.8		)	(58.4		)
Total deferred tax assets, net of valuation allowance	$	568.5		$	621.3
Deferred tax liabilities:
Property, plant and equipment	$	125.1		$	159.8
Federal deferred liability on state deferred tax assets	7.2			7.8
Other	1.6			—
Total deferred tax liabilities	133.9			167.6
Net deferred tax assets	$	434.6		$	453.7

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)	2012			2011		2010
Balance, beginning of year	$	21.8		$	20.5	$	16.7
Change in tax positions for the current year	1.4			1.3		4.0
Change in tax positions for prior years	(0.4		)	—		(0.2		)
Balance, end of year	$	22.8		$	21.8	$	20.5