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Shareowners' Deficit (Tables)
 9 Months Ended
Sep. 30, 2017
Shareowners' Deficit [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
For the nine months ended September 30, 2017, the changes in accumulated other comprehensive loss by component were as follows:
(dollars in millions)
Unrecognized Net Periodic Pension and Postretirement Benefit Cost
 
Unrealized gain on Investment in CyrusOne
 
Foreign Currency Translation Loss
 
Total
Balance as of December 31, 2016
$
(157.6
)
 
$
68.1

 
$
(0.8
)
 
$
(90.3
)
Unrealized gain on Investment in CyrusOne, net
—

 
8.3

(a)
—

 
8.3

Reclassifications, net
8.5

(b)
(76.4
)
(c)
—

 
(67.9
)
Foreign currency gain
$
—

 
$
—

 
$
0.1

 
$
0.1

Balance as of September 30, 2017
$
(149.1
)
 
$
—

 
$
(0.7
)
 
$
(149.8
)