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Restructuring Charges (Tables)
 12 Months Ended
Dec. 31, 2017
Restructuring and Related Activities [Abstract]  
Schedule of Restructuring and Related Costs
A summary of activity in the restructuring and severance liability is shown below:
(dollars in millions)
Employee
Separation
 
Lease
Abandonment
 
Other
 
Total
Balance as of December 31, 2014
$
3.0

 
$
1.8

 
$
0.1

 
$
4.9

Charges
3.3

 
0.3

 
2.4

 
6.0

Utilizations
(6.1
)
 
(1.3
)
 
(2.4
)
 
(9.8
)
Balance as of December 31, 2015
0.2

 
0.8

 
0.1

 
1.1

Charges/(Reversals)
12.5

 
(0.5
)
 
(0.1
)
 
11.9

Utilizations
(1.7
)
 
(0.1
)
 
—

 
(1.8
)
Balance as of December 31, 2016
11.0

 
0.2

 
—

 
11.2

Charges
32.7

 
—

 
—

 
32.7

Utilizations
(29.3
)
 
(0.1
)
 
—

 
(29.4
)
Balance as of December 31, 2017
$
14.4

 
$
0.1

 
$
—

 
$
14.5
Schedule of Restructuring and Related Costs by Segment [Table Text Block]
A summary of restructuring activity by business segment is presented below:
(dollars in millions)
Entertainment and Communications
 
IT Services and Hardware
 
Corporate
 
Total
Balance as of December 31, 2014
$
3.9

 
$
0.3

 
$
0.7

 
$
4.9

Charges
1.6

 
2.8

 
1.6

 
6.0

Utilizations
(4.7
)
 
(2.8
)
 
(2.3
)
 
(9.8
)
Balance as of December 31, 2015
0.8

 
0.3

 
—

 
1.1

Charges
7.7

 
3.3

 
0.9

 
11.9

Utilizations
(1.0
)
 
(0.6
)
 
(0.2
)
 
(1.8
)
Balance as of December 31, 2016
7.5

 
3.0

 
0.7

 
11.2

Charges
27.9

 
4.8

 
—

 
32.7

Utilizations
(23.1
)
 
(5.6
)
 
(0.7
)
 
(29.4
)
Balance as of December 31, 2017
$
12.3

 
$
2.2

 
$
—

 
$
14.5