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Derivative Instruments and Hedging Activities (Tables)
 12 Months Ended
Dec. 31, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]  
Impact of Derivative Instruments On Statements of Income and Accumulated OCI
The impact of derivative instruments on the consolidated statements of income and accumulated OCI was as follows (dollars in millions):
 
Net
Loss Recognized in
Accumulated OCI
(Effective Portion)
December 31
 
2015
 
2014
Treasury locks, net of tax
$
(21.2
)
 
$
(24.7
)

 
Gain (Loss) Reclassified
from Accumulated OCI into
Income
(Effective Portion)
Year Ended December 31
Location
2015
 
2014
 
2013
Amortization of treasury locks (included in interest expense, net)
$
(5.7
)
 
$
(5.7
)
 
$
(5.7
)