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10. Other Income and Expenses (Tables)
 12 Months Ended
Dec. 31, 2018
Other Income and Expenses [Abstract]  
Schedule of other income (expense), net Other (income) expense, net includes the following components (in millions):
 
 
Year Ended December 31,
 
 
2018
 
2017
 
2016
 
 
 
 
 
 
 
Interest and investment income
 
$
(26.6
)
 
$
(19.1
)
 
$
(14.7
)
Net realized gains on investments
 
(1.6
)
 
(0.1
)
 
(0.8
)
Other-than-temporary impairment losses on investments
 
0.8

 
7.0

 
0.6

Gain on sale of land
 
(4.1
)
 
—

 
—

Gain on divestiture of product line
 
(5.1
)
 
—

 
—

Other expense
 
—

 
1.5

 
1.1

Other (income) expense, net
 
$
(36.6
)
 
$
(10.7
)
 
$
(13.8
)