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8. Other Income and Expenses (Tables)
 3 Months Ended
Mar. 31, 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
 
March 31,
 
2018
 
2017
Interest and investment income
$
(2.1
)
 
$
(1.1
)
Net realized loss (gain) on investments
0.1

 
(0.3
)
Gain on sale of land
(4.1
)
 
—

Gain on divestiture of product line
(5.1
)
 
—

Other expense
0.1

 
0.4

Other (income) expense, net
$
(11.1
)
 
$
(1.0
)