Fair value of financial instruments (Tables)

3 Months Ended

Mar. 31, 2017

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, 2017		December 31, 2016
Unsecured notes issued in a private placement
Carrying value	$	78.6	85.7
Fair value	79.9		88.2