Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2018

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis

The following table provides information by level for assets and liabilities that are measured at fair value on a recurring basis for year ended December 31, 2018 and December 31, 2017:

Description		December 31, 2018		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Unobservable Inputs (Level 3)
		(In millions)
Assets:
Trading securities	$	—	$	—	$	—	$	—

Description	December 31, 2017		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Unobservable Inputs (Level 3)
	(In millions)
Assets:
Trading securities	$	0.2	$	0.2	$	—	$	—