Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2014

Supplemental Cash Flow Information [Abstract]

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

	Year Ended December 31,
(dollars in millions)	2014		2013		2012
Capitalized interest expense	$	0.8	$	0.6	$	2.7
Cash paid for:
Interest	153.1		179.5		217.9
Income taxes, net of refunds	9.1		2.8		0.1
Noncash investing and financing activities:
Investment in CyrusOne resulting from deconsolidation	—		509.7		—
Accrual of CyrusOne dividends	6.0		7.1		—
Acquisition of property by assuming debt and other financing arrangements	4.7		7.6		19.9
Acquisition of property on account	24.8		13.3		30.7
Accrued CyrusOne stock issuance costs	—		—		2.2