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DEBT AND CREDIT FACILITIES (Tables)
12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Summary of the Notes
The following is a summary of the Notes as of December 31, 2019 and 2018:
 
December 31,
 
2019
 
2018
 
Amount
 
Effective
Interest Rate
 
Amount
 
Effective
Interest Rate
 
(in millions)
 
 
 
(in millions)
 
 
Fixed-rate 4.300% 2018 Notes
$
600.0

 
4.329
%
 
$
600.0

 
4.329
%
Unamortized discount
(1.2
)
 
 

 
(1.3
)
 
 

Unamortized debt issuance costs
(4.4
)
 
 
 
(4.9
)
 
 
Total carrying amount
$
594.4

 
 

 
$
593.8