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Net Loss Per Share (Tables)
 9 Months Ended
Oct. 31, 2018
Earnings Per Share [Abstract]  
Schedule of computation of the numerators and denominators used in the basic and diluted net loss per share amounts The following table sets forth the computation of the numerators and denominators used in the basic and diluted net loss per share amounts:

 
Three Months Ended October 31,
 
Nine Months Ended October 31,
 
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
Net loss
$
(23.7
)
 
$
(119.8
)
 
$
(145.5
)
 
$
(393.4
)
Denominator:
 
 
 
 
 
 
 
Denominator for basic net loss per share—weighted average shares
218.9

 
219.6

 
218.7

 
219.7

Effect of dilutive securities (1)
—

 
—

 
—

 
—

Denominator for dilutive net loss per share
218.9

 
219.6

 
218.7

 
219.7

Basic net loss per share
$
(0.11
)
 
$
(0.55
)
 
$
(0.67
)
 
$
(1.79
)
Diluted net loss per share
$
(0.11
)
 
$
(0.55
)
 
$
(0.67
)
 
$
(1.79
)

____________________ 
(1)
The effect of dilutive securities of 2.7 million and 4.1 million shares in the three months ended October 31, 2018 and 2017, respectively, have been excluded from the calculation of diluted net loss per share as those shares would have been anti-dilutive due to the net loss incurred during those periods. The effect of dilutive securities of 3.0 million and 4.4 million shares in the nine months ended October 31, 2018 and 2017, respectively, has been excluded from the calculation of diluted net loss per share as those shares would have been anti-dilutive due to the net loss incurred during those periods.