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Supplemental Financial Statement Information (Tables)
 12 Months Ended
Dec. 31, 2016
Additional Financial Information Disclosure [Abstract]  
Schedule of cash and cash equivalents
Cash and cash equivalents at December 31, 2016 and 2015 were as follows:
(In millions)
 
2016
 
2015
Cash
 
$
164.1

 
$
149.3

Other short-term investments
 
65.5

 
0.5

Total cash and cash equivalents
 
$
229.6

 
$
149.8
Schedule of other non-operating income (expense)
Other income (expense) from continuing operations for the years ended December 31, 2016, 2015, and 2014 was as follows:
(In millions)
 
2016
 
2015
 
2014
Rent and royalty income
 
$
1.4

 
$
2.0

 
$
4.0

Net gains on property and investments
 
1.0

 
—

 
0.1

Other
 
—

 
(0.4
)
 
—

Total other income, net
 
$
2.4

 
$
1.6

 
$
4.1