Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2015

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value Recurring Basis

The following tables present our assets and liabilities that are measured at fair value on a recurring basis at March 31, 2015:

	Fair Value Measurements at March 31, 2015
Assets	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(In millions)
Marketable securities (Other assets)	$	8.8	$	8.8	$	—	$	—
Derivative contracts		138.2		—		138.2		—
Total	$	147.0	$	8.8	$	138.2	$	—

	Fair Value Measurements at March 31, 2015
Liabilities	Total		Quoted Prices in Active Markets for Identical Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(In millions)
Derivative contracts	$	—	$	—	$	—	$	—
Total	$	—	$	—	$	—	$	—

The following tables present our assets and liabilities that are measured at fair value on a recurring basis at December 31, 2014:

	Fair Value Measurements at December 31, 2014
Assets	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(In millions)
Marketable securities (Other assets)	$	8.4	$	8.4	$	—	$	—
Derivative contracts		153.5		—		153.5		—
Total	$	161.9	$	8.4	$	153.5	$	—

	Fair Value Measurements at December 31, 2014
Liabilities	Total		Quoted Prices in Active Markets for Identical Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
	(In millions)
Derivative contracts	$	—	$	—	$	—	$	—
Total	$	—	$	—	$	—	$	—