Unusual Items (Tables)

6 Months Ended

Jun. 30, 2018

Unusual or Infrequent Items, or Both [Abstract]

Summary of Unusual Items Expense

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

	Three months ended June 30,					Six months ended June 30,
	2018		2017			2018		2017
	(In millions)
Unusual items
Legal related matters	$	—	$	(1.3	)	$	—	$	(1.9	)
Acquisition costs	—		—			—		1.0
	$	—	$	(1.3	)	$	—	$	(0.9	)