Supplemental Financial Statement Information (Tables)

12 Months Ended

Dec. 31, 2017

Additional Financial Information Disclosure [Abstract]

Schedule of cash and cash equivalents

Cash and cash equivalents at December 31, 2017 and 2016 were as follows:

(In millions)	2017		2016
Cash	$	140.2	$	164.1
Other short-term investments	1.4		65.5
Total cash and cash equivalents	$	141.6	$	229.6

Schedule of other non-operating income (expense)

Other income (expense) for the years ended December 31, 2017, 2016, and 2015 was as follows:

(In millions)	2017		2016		2015
Rent and royalty income	$	3.5	$	1.4	$	2.0
Net gains on property and investments	0.5		1.0		—
Other	—		—		(0.4		)
Total other income, net	$	4.0	$	2.4	$	1.6