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Investment in CyrusOne (Tables)
 9 Months Ended
Sep. 30, 2016
Related Party Revenues and Expenses [Member]  
Related Party Transaction [Line Items]  
Schedule of Related Party Transactions [Table Text Block]
Revenues and operating costs and expenses from transactions with CyrusOne were as follows:
 
Three Months Ended
 
Nine Months Ended
 
September 30,
 
September 30,
(dollars in millions)
2016
 
2015
 
2016
 
2015
Revenue:
 
 
 
 
 
 
 
Services provided to CyrusOne
$
0.3

 
$
0.3

 
$
0.9

 
$
1.0

 
 
 
 
 
 
 
 
Operating costs and expenses:
 
 
 
 
 
 
 
Charges for services provided by CyrusOne
2.4

 
2.6

 
7.6

 
7.6

Administrative services provided to CyrusOne
(0.1
)
 
(0.1
)
 
(0.2
)
 
(0.3
)
Total operating costs and expenses
$
2.3

 
$
2.5

 
$
7.4

 
$
7.3
Related Party Receivables and Payables [Member]  
Related Party Transaction [Line Items]  
Schedule of Related Party Transactions [Table Text Block]
At September 30, 2016 and December 31, 2015, amounts receivable from and payable to CyrusOne were as follows:
 
 
September 30,
 
December 31,
(dollars in millions)
 
2016
 
2015
Accounts receivable
 
$
—

 
$
0.1

Dividends receivable
 
1.2

 
2.1

  Receivable from CyrusOne
 
$
1.2

 
$
2.2

 
 
 
 
 
Payable to CyrusOne

 
$
1.4

 
$
1.5