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Accumulated Other Comprehensive Income , Net of Taxes (Tables)
 12 Months Ended
Jan. 31, 2012
Accumulated Other Comprehensive Income (loss) [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss), net of taxes, was comprised of the following at January 31:
 
January 31,
 
2012
 
2011
 
2010
Net gain (loss) on derivative instruments
$
9.2

 
$
(0.8
)
 
$
2.3

Net unrealized gain on available-for-sale securities
2.6

 
2.4

 
1.5

Unfunded portion of pension plans
(8.6
)
 
(9.8
)
 
(5.9
)
Foreign currency translation adjustments
2.7

 
7.6

 
(1.4
)
Accumulated other comprehensive income (loss)
$
5.9

 
$
(0.6
)
 
$
(3.5
)