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DEBT (Tables)
 12 Months Ended
Dec. 31, 2016
Debt Disclosure [Abstract]  
Components of long-term debt
he components of long-term debt were as follows: 
(Dollars in millions)
 
December 31,
Principal Value:
 
2016
 
2015
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
 
5.1

 
7.0

Unamortized bond discount
 
(4.3
)
 
(4.8
)
Unamortized debt issuance costs
 
(19.4
)
 
(21.6
)
Fair-value interest rate swaps
 
(5.2
)
 
0.4

Long-term debt
 
$
2,976.2

 
$
2,981.0
Components of interest expense-net
The components of interest expense-net were as follows: 
 
Years Ended December 31,
(Dollars in millions)
2016
 
2015
 
2014
Interest expense
$
118.7

 
$
74.6

 
$
69.9

Interest income
(13.3
)
 
(9.6
)
 
(9.6
)
Interest expense-net
$
105.4

 
$
65.0

 
$
60.3

Interest payments, net of amounts related to interest rate swaps
$
120.2

 
$
66.6

 
$
72.5