Fair Value Measurement Disclosures (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Estimated Fair Values of Financial Instruments

The estimated fair values of our financial instruments are as follows (in millions):

		June 30, 2018				December 31, 2017
	Fair Value	Carrying		Fair		Carrying		Fair
Description	Hierarchy	Amount		Value		Amount		Value
12.5% senior secured notes (note 9)	Level 2	$	260.3		271.4	$	260.3		269.1
10 3/4% Series B cumulative exchangeable      redeemable preferred stock (note 10)	Level 3		170.4		38.9		165.6		38.1