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Fair value of financial instruments (Tables)
3 Months Ended
Mar. 31, 2018
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 are as follows:
(In millions)
March 31, 2018
 
December 31, 2017
 
 
 
 
Senior unsecured notes
 
 
 
Carrying value
$
600.0

 
600.0

Fair value
558.9

 
590.6