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Interest and Other Nonoperating Income (Expense) (Tables)
 12 Months Ended
Dec. 31, 2016
Interest and Other Income [Abstract]  
Schedule of Other Nonoperating Income (Expense)
Interest and Other Nonoperating Income (Expense)

 
Years Ended December 31,
(In millions)
2016
 
2015
 
2014
 
 
 
 
 
 
Interest income
$
2.6

 
3.3

 
3.0

Gain on marketable securities
0.5

 
1.1

 
0.4

Derivative instruments
(0.6
)
 
(0.5
)
 
(1.0
)
Other
(1.3
)
 
(0.5
)
 
(0.5
)
Total
$
1.2

 
3.4

 
1.9