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Accumulated Other Comprehensive Loss (Tables)
 6 Months Ended
Jul. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated other comprehensive loss, net of taxes Accumulated other comprehensive loss, net of taxes, consisted of the following at July 31, 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
15.1

 
(0.7
)
 
11.3

 
(54.5
)
 
(28.8
)
Pre-tax losses reclassified from accumulated other comprehensive loss
4.3

 
—

 
0.2

 
—

 
4.5

Tax effects
(1.8
)
 
—

 
(1.5
)
 
0.5

 
(2.8
)
Net current period other comprehensive income (loss)
17.6

 
(0.7
)
 
10.0

 
(54.0
)
 
(27.1
)
Balances, July 31, 2018
$
1.0

 
$
0.6

 
$
(19.3
)
 
$
(133.2
)
 
$
(150.9
)