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DEBT (Tables)
 9 Months Ended
Sep. 30, 2016
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
The components of long-term debt were as follows: 
(Dollars in millions)
 
September 30, 2016
 
December 31, 2015
Principal Value:
 
 

 
 

4.900% Notes due 2019 (“2019 Notes”)
 
$
700.0

 
$
700.0

3.000% Notes due 2020 (“2020 Notes”)
 
750.0

 
750.0

4.125% Notes due 2025 (“2025 Notes”)
 
750.0

 
750.0

5.900% Notes due 2039 (“2039 Notes”)
 
300.0

 
300.0

4.600% Notes due 2044 (“2044 Notes”)
 
500.0

 
500.0

Sub-total
 
3,000.0

 
3,000.0

Adjustments to Principal Value:
 
 

 
 

Unamortized basis adjustment for settled interest rate swaps
 
5.6

 
7.0

Unamortized bond discount
 
(4.4
)
 
(4.8
)
Unamortized debt issuance costs
 
(20.0
)
 
(21.6
)
Fair-value interest rate swaps
 
27.2

 
0.4

Long-term debt
 
$
3,008.4

 
$
2,981.0
Interest Income and Interest Expense Disclosure
The components of interest expense-net were as follows: 
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
(Dollars in millions)
 
2016
 
2015
 
2016
 
2015
Interest expense
 
$
29.8

 
$
16.8

 
$
88.3

 
$
49.7

Interest income
 
(3.5
)
 
(2.0
)
 
(9.4
)
 
(7.2
)
Interest expense-net
 
$
26.3

 
$
14.8

 
$
78.9

 
$
42.5