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Accumulated Other Comprehensive Income (Loss) (Tables)
 3 Months Ended
Apr. 30, 2015
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive loss, net of taxes, consisted of the following at April 30, 2015:

 
Net Unrealized Gains (Losses) on Derivative Instruments
 
Net Unrealized Gains (Losses) on Available-for-Sale Securities
 
Defined Benefit Pension Components
 
Foreign Currency Translation Adjustments
 
Total
Balances, January 31, 2015
$
42.8

 
$
1.6

 
$
(23.7
)
 
$
(74.0
)
 
$
(53.3
)
Other comprehensive income (loss) before reclassifications
3.8

 
0.2

 
0.4

 
(2.0
)
 
2.4

Pre-tax (gains) losses reclassified from accumulated other comprehensive income
(7.7
)
 
0.1

 
0.3

 
—

 
(7.3
)
Tax effects
(1.5
)
 
(0.1
)
 
—

 
3.8

 
2.2

Net current period other comprehensive (loss) income
(5.4
)
 
0.2

 
0.7

 
1.8

 
(2.7
)
Balances, April 30, 2015
$
37.4

 
$
1.8

 
$
(23.0
)
 
$
(72.2
)
 
$
(56.0
)