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9. Other Income and Expenses
 6 Months Ended
Jun. 30, 2016
Other Income and Expenses [Abstract]  
Other Income and Other Expense Disclosure
9.    OTHER INCOME AND EXPENSE, NET

Other (income) expense, net includes the following components (in millions):

 
Three Months Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2016
 
2015
 
2016
 
2015
Interest and investment income
$
(10.6
)
 
$
(7.1
)
 
$
(11.9
)
 
$
(8.0
)
Net realized gain on investments
(0.6
)
 
—

 
(0.5
)
 
(0.3
)
Other (income) expense, net
$
(11.2
)
 
$
(7.1
)
 
$
(12.4
)
 
$
(8.3
)