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8. Other Income and Expenses (Tables)
 6 Months Ended
Jun. 30, 2018
Other Income and Expenses [Abstract]  
Schedule of other income (expense), net Other (income) expense, net includes the following components (in millions):

 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2018
 
2017
 
2018
 
2017
Interest and investment income
$
(16.2
)
 
$
(12.0
)
 
$
(18.3
)
 
$
(13.1
)
Net realized loss (gain) on investments
0.1

 
0.2

 
0.2

 
(0.1
)
Gain on sale of land
—

 
—

 
(4.1
)
 
—

Gain on divestiture of product line
—

 
—

 
(5.1
)
 
—

Other expense
0.2

 
0.4

 
0.3

 
0.8

Other (income) expense, net
$
(15.9
)
 
$
(11.4
)
 
$
(27.0
)
 
$
(12.4
)