Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2015

Supplemental Cash Flow Information [Abstract]

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

	Year Ended December 31,
(dollars in millions)	2015		2014		2013
Capitalized interest expense	$	1.1	$	0.8	$	0.6
Cash paid for:
Interest	108.5		153.1		179.5
Income taxes, net of refunds	8.8		9.1		2.8
Noncash investing and financing activities:
Investment in CyrusOne resulting from deconsolidation	—		—		509.7
Accrual of CyrusOne dividends	2.1		6.0		7.1
Acquisition of property by assuming debt and other financing arrangements	5.8		4.7		7.6
Acquisition of property on account	34.6		24.8		13.3