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Other Income, Net (Tables)
 3 Months Ended
Mar. 31, 2017
Other Income and Expenses [Abstract]  
Other Income, Net
Other income, net consisted of the following for each period presented (in millions of dollars):
 
Quarter Ended
 
March 31,
 
2017
 
2016
Interest income
$
—

 
$
0.1

Realized gain on investments
0.7

 
—

All other (expense) income, net
(0.1
)
 
0.2

Other income, net
$
0.6

 
$
0.3