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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2019
Fair Value Disclosures [Abstract]  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments
The fair value and carrying value of our fixed-rate debt, excluding any unamortized debt issuance costs, are as follows:
 
December 31,
(In millions)
2019
 
2018
 
 
 
 
Senior unsecured notes
 
 
 
Carrying value
$
600.0

 
600.0

Fair value
624.7

 
519.9