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9. Other Income and Expenses (Tables)
 6 Months Ended
Jun. 30, 2017
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,
 
2017
 
2016
 
2017
 
2016
Interest and investment income
$
(12.0
)
 
$
(10.6
)
 
$
(13.1
)
 
$
(11.9
)
Net realized loss (gain) on investments
0.2

 
(0.6
)
 
(0.1
)
 
(0.5
)
Other (income) expense, net
$
(11.8
)
 
$
(11.2
)
 
$
(13.2
)
 
$
(12.4
)