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10. Other Income and Expenses (Tables)
 12 Months Ended
Dec. 31, 2016
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,
 
 
2016
 
2015
 
2014
 
 
 
 
 
 
 
Interest and investment income
 
$
(14.7
)
 
$
(10.1
)
 
$
(13.5
)
Net realized gains on investments
 
(0.8
)
 
(1.6
)
 
—

Other-than-temporary impairment losses on investments
 
0.6

 
0.6

 
0.4

Miscellaneous other (income) expense items, net
 
—

 
—

 
0.1

Other (income) expense, net
 
$
(14.9
)
 
$
(11.1
)
 
$
(13.0
)