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Accumulated Other Comprehensive Loss (Tables)
 12 Months Ended
Dec. 31, 2011
Accumulated Other Comprehensive Loss, net of tax [Abstract]  
Schedule of Accumulated Other Comprehensive Loss
The components of accumulated other comprehensive loss, net of tax are listed below.
 
December 31,
 
2011
 
2010
 
2009
Foreign currency translation adjustment
$
(140.9
)
 
$
(51.3
)
 
$
(85.3
)
Unrecognized losses, transition obligation and prior service cost
(85.0
)
 
(67.7
)
 
(90.9
)
Net unrealized holding gains (losses) on securities
0.2

 
0.0

 
(0.4
)
    Accumulated other comprehensive loss, net of tax
$
(225.7
)
 
$
(119.0
)
 
$
(176.6
)