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9. Other Income and Expenses (Tables)
 3 Months Ended
Mar. 31, 2020
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,
 
2020
 
2019
Interest and investment income
$
(2.8
)
 
$
(19.5
)
Net realized gain on investments
(0.4
)
 
—

Other-than-temporary impairment loss on investment
—

 
1.6

Other (income) expense
(0.1
)
 
(0.8
)
Other (income) expense, net
$
(3.3
)
 
$
(18.7
)