Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Income Tax Provision (Benefit) Charged to Continuing Operations, Accumulated Other Comprehensive Income (Loss) or Additional Paid-In Capital [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)	2013			2012			2011
Current:
Federal	$	—		$	1.8		$	—
State and local	—			1.6			0.4
Total current	—			3.4			0.4
Investment tax credits	(0.2		)	(0.3		)	(0.3		)
Deferred:
Federal	(13.0		)	21.8			24.3
State and local	(3.7		)	2.0			3.4
Foreign	0.3			(0.5		)	0.1
Total deferred	(16.4		)	23.3			27.8
Valuation allowance	14.1			(1.7		)	(2.9		)
Total	$	(2.5	)	$	24.7		$	25.0

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,
	2013		2012		2011
U.S. federal statutory rate	35.0	%	35.0	%	35.0	%
State and local income taxes, net of federal income tax	1.5		3.9		2.9
Change in valuation allowance, net of federal income tax	(15.8	)	(2.3	)	(4.4	)
State net operating loss adjustments	2.7		3.7		2.7
Nondeductible interest expense	(11.4	)	18.1		15.0
Unrecognized tax benefit changes	(2.1	)	2.2		2.8
Nondeductible compensation	(2.5	)	2.7		2.1
Foreign	(0.7	)	3.5		0.1
Other differences, net	(2.3	)	2.0		1.1
Effective tax rate	4.4	%	68.8	%	57.3	%

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

	Year Ended December 31,
(dollars in millions)	2013			2012			2011
Income tax (benefit) provision related to:
Continuing operations	$	(2.5	)	$	24.7		$	25.0
Accumulated other comprehensive income (loss)	42.1			(0.4		)	(26.5		)
Excess tax benefits on stock option exercises	(0.5		)	(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)	2013			2012
Deferred tax assets:
Net operating loss carryforwards	$	452.3		$	410.8
Pension and postretirement benefits	81.9			144.6
Equity method investment in CyrusOne	41.5			—
Other	63.2			69.9
Total deferred tax assets	638.9			625.3
Valuation allowance	(68.3		)	(56.8		)
Total deferred tax assets, net of valuation allowance	$	570.6		$	568.5
Deferred tax liabilities:
Property, plant and equipment	$	171.8		$	125.1
Federal deferred liability on state deferred tax assets	3.5			7.2
Other	0.3			1.6
Total deferred tax liabilities	175.6			133.9
Net deferred tax assets	$	395.0		$	434.6

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

A reconciliation of the unrecognized tax benefits is as follows:

	Year Ended December 31,
(dollars in millions)	2013		2012			2011
Balance, beginning of year	$	22.8	$	21.8		$	20.5
Change in tax positions for the current year	1.3		1.4			1.3
Change in tax positions for prior years	—		(0.4		)	—
Balance, end of year	$	24.1	$	22.8		$	21.8