Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2012

Supplemental Cash Flow Information [Abstract]

Schedule of Cash Flow, Supplemental Disclosures [Table Text Block]

	Year Ended December 31,
(dollars in millions)	2012		2011			2010
Capitalized interest expense	$	2.7	$	3.5		$	0.9
Cash paid /(received) for:
Interest	217.9		211.8			172.4
Income taxes, net of refunds	0.1		(1.2		)	3.5
Noncash investing and financing activities:
Acquisition of property by assuming debt and other financing arrangements	19.9		49.7			21.0
Acquisition of property on account	30.7		22.8			9.6
Accrued CyrusOne stock issuance costs	2.2		—			—