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DEBT (Tables)
6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments
The following is a summary of the Notes as of June 30, 2018 and December 31, 2017:

 
June 30, 2018
 
December 31, 2017
 
Amount
 
Effective
Interest Rate
 
Amount
 
Effective
Interest Rate
 
(in millions)
 
 
 
(in millions)
 
 
Fixed-rate 4.300% notes
$
600.0

 
4.329
%
 
$

 
%
Fixed-rate 2.875% notes
600.0

 
2.983
%
 
600.0

 
2.983
%
Total senior notes
1,200.0

 
 
 
600.0

 
 
Unamortized discount
(1.6
)
 
 

 
(0.5
)
 
 

Unamortized debt issuance costs
(5.0
)
 
 
 
(0.8
)
 
 
Hedge accounting fair value adjustments (see Note 8)
(0.3
)
 
 

 
(0.7
)
 
 

Total carrying amount
$
1,193.1

 
 

 
$
598.0