Unusual Items (Tables)

3 Months Ended

Mar. 31, 2018

Unusual or Infrequent Items, or Both [Abstract]

Summary of Unusual Items Expense

Total unusual items, a component of other expense, net in the unaudited condensed consolidated statements of operations, were as follows:

	Three months ended March 31,
	2018		2017
	(In millions)
Unusual items
Legal related matters	$	—	$	(0.6	)
Acquisition costs	—		1.0
	$	—	$	0.4