Supplemental Financial Statement Information (Tables)

12 Months Ended

Dec. 31, 2018

Additional Financial Information Disclosure [Abstract]

Schedule of cash and cash equivalents

Cash and cash equivalents at December 31, 2018 and 2017 were as follows:

(In millions)	2018		2017
Cash	$	264.4	$	140.2
Other short-term investments	117.6		1.4
Total cash and cash equivalents	$	382.0	$	141.6

Schedule of other non-operating income (expense)

Other income (expense) for the years ended December 31, 2018, 2017, and 2016 was as follows:

(In millions)	2018			2017		2016
Rent and royalty income	$	3.1		$	3.5	$	1.4
Net gains on property and investments	1.3			0.5		1.0
Net equity loss on joint ventures (See Note 6)	(1.0		)	—		—
Gain on joint venture deconsolidation (See Note 6)	15.9			—		—
Other	1.2			—		—
Total other income, net	$	20.5		$	4.0	$	2.4