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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2017
Fair Value Disclosures [Abstract]  
Fixed Rate Debt
The fair values and carrying values of our significant fixed-rate debt, excluding any unamortized issuance costs, was as follows:
 
December 31,
(In millions)
2017
 
2016
 
 
 
 
Unsecured notes issued in a private placement(a)
 
 
 
Carrying value
$

 
85.7

Fair value

 
88.2

 
 
 
 
Senior unsecured notes
 
 
 
Carrying value
600.0

 

Fair value
590.6

 


(a)
Prepaid in September 2017.