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Accumulated Other Comprehensive Income (Tables)
 12 Months Ended
Dec. 31, 2012
Accumulated Other Comprehensive Income [Abstract]  
Components of accumulated other comprehensive income
The components of accumulated other comprehensive income, net of tax, were as follows:
 
 
 
 
 
 
 
 
 
Year Ended December 31
 
2012
 
2011
 
Foreign currency translation
 
$
186.8
 
$
186.6
 
Translation loss on net investment hedge, net of income taxes of $(31.3) and $(26.5), respectively
 
 
(51.1
)
 
(43.2
)
Translation loss on long-term intercompany loans
 
 
(73.4
)
 
(89.1
)
Unrealized gain on investments, net of income taxes of $3.9 and $2.8, respectively
 
 
11.8
 
 
8.2
 
Defined benefit pension plans, net of income taxes of $(22.6) and $(19.5), respectively
 
 
(37.0
)
 
(26.5
)
Retiree health care plan, net of income taxes of $(1.7) and $(0.5), respectively
 
 
(2.7
)
 
(0.7
)
Accumulated other comprehensive income
 
$
34.4
 
$
35.3