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Accumulated Other Comprehensive Loss (Tables)
 3 Months Ended
Apr. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Other Comprehensive Loss Accumulated other comprehensive loss, net of taxes, consisted of the following at April 30, 2018:

 
Net Unrealized Gains (Losses) on Derivative Instruments
 
Net Unrealized Gains (Losses) on Available-for-Sale Debt Securities
 
Defined Benefit Pension Components
 
Foreign Currency Translation Adjustments
 
Total
Balances, January 31, 2018
$
(16.6
)
 
$
1.3

 
$
(29.3
)
 
$
(79.2
)
 
$
(123.8
)
Other comprehensive income (loss) before reclassifications
7.6

 
0.5

 
9.0

 
(24.6
)
 
(7.5
)
Pre-tax (gains) losses reclassified from accumulated other comprehensive loss
(0.9
)
 
—

 
0.1

 
—

 
(0.8
)
Tax effects
(0.7
)
 
0.1

 
(1.4
)
 
0.3

 
(1.7
)
Net current period other comprehensive income (loss)
6.0

 
0.6

 
7.7

 
(24.3
)
 
(10.0
)
Balances, April 30, 2018
$
(10.6
)
 
$
1.9

 
$
(21.6
)
 
$
(103.5
)
 
$
(133.8
)