Acquisitions and Dispositions (Tables)

12 Months Ended

Dec. 31, 2011

Business Combinations [Abstract]

Schedule of Purchase Price Allocation [Table Text Block]

The following table summarizes the allocation of the assets acquired and liabilities assumed at the acquisition date:

(dollars in millions)
Assets acquired
Receivables	$	10.4
Other current assets	0.5
Property, plant and equipment	153.6
Goodwill	269.6
Intangible assets	138.0
Other noncurrent assets	0.1
Total assets acquired	572.2
Liabilities assumed
Accounts payable	3.1
Unearned revenue and customer deposits	7.7
Accrued taxes	1.5
Accrued payroll and benefits	0.7
Other current liabilities	0.8
Noncurrent liabilities	32.1
Total liabilities assumed	45.9
Net assets acquired	$	526.3

Business Acquisition, Pro Forma Information [Table Text Block]

The following unaudited pro forma consolidated results assume the acquisition of CyrusOne was completed as of the beginning of the annual reporting periods presented:

	Year Ended December 31,
(dollars in millions, except per share amounts)	2010		2009
Revenue	$	1,408.6	$	1,392.7
Net income	23.3		65.1
Earnings per share:
Basic earnings per common share	$	0.06	$	0.26
Diluted earnings per common share	0.06		0.25