DEBT (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Components of long-term debt

As of December 31, 2015 and 2014, respectively, the components of long-term debt were as follows: 

(Dollars in millions)	December 31,
Principal Value:	2015			2014
4.900% Notes due 2019	$	700.0		$	700.0
3.000% Notes due 2020	750.0			—
4.125% Notes due 2025	750.0			—
5.900% Notes due 2039	300.0			300.0
4.600% Notes due 2044	500.0			500.0
Sub-total	$	3,000.0		$	1,500.0
Adjustments to Principal Value:
Unamortized basis adjustment for settled interest rate swaps	7.0			8.8
Unamortized bond discount	(4.8		)	(4.0		)
Unamortized debt issuance costs	(21.6		)	(11.1		)
Fair-value interest rate swaps	0.4			(0.9		)
Long-term debt	$	2,981.0		$	1,492.8

Components of interest expense-net

The components of interest expense-net were as follows: 

	Years Ended December 31,
(Dollars in millions)	2015			2014			2013
Interest expense	$	74.6		$	69.9		$	59.2
Interest income	(9.6		)	(9.6		)	(8.6		)
Interest expense-net	$	65.0		$	60.3		$	50.6
Interest payments, net of amounts related to interest rate swaps	$	66.6		$	72.5		$	72.0