Financial Instruments (Tables)

9 Months Ended

Sep. 30, 2018

Valuation of Financial Instruments Recorded on Fair Value Basis

The following table summarizes the valuation of our financial instruments recorded on a fair value basis as of December 31, 2017 and September 30, 2018:

	Fair Value Measurements
			Quoted		Significant
			prices in		other		Significant
			active		observable		unobservable
			markets		inputs		inputs
	Total		(Level 1)		(Level 2)		(Level 3)
	(In millions)
Asset:
December 31, 2017 -
Noncurrent marketable securities (See Note 4)	$	10.7	$	10.7	$	-	$	-

September 30, 2018 -
Noncurrent marketable securities (See Note 4)	$	4.0	$	4.0	$	-	$	-

Financial Instruments not Carried at Fair Value but which Require Fair Value Disclosure

The following table presents the financial instruments that are not carried at fair value but which require fair value disclosure:

	December 31, 2017				September 30, 2018
	Carrying amount		Fair value		Carrying amount		Fair value
	(In millions)
Cash, cash equivalents and restricted cash	$	323.7	$	323.7	$	433.4	$	433.4
Long-term debt -
Fixed rate Senior Notes		471.1		495.1		463.0		455.1
Common stockholders' equity		754.3		2,986.8		873.4		1,883.5