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10. Other Income and Expenses (Tables)
 12 Months Ended
Dec. 31, 2012
Other Income and Expense [Abstract]  
Schedule of other income (expense), net
Other (income) expense, net includes the following components (in millions):
 
 
Year Ended December 31,
 
 
2012
 
2011
 
2010
 
 
 
 
 
 
 
Interest and investment income
 
$
(11.4
)
 
$
(8.2
)
 
$
(5.2
)
Net realized gains on investments
 
(8.7
)
 
(0.7
)
 
(0.6
)
Other-than-temporary impairment losses on investments
 
1.0

 
2.1

 
0.2

(Gains) losses on sale of property, plant and equipment
 
(3.8
)
 
0.2

 
0.5

Miscellaneous other expense (income) items, net
 
1.0

 
(1.0
)
 
1.2

Other (income) expense, net
 
$
(21.9
)
 
$
(7.6
)
 
$
(3.9
)