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Investments (Tables)
 3 Months Ended
May 02, 2015
Investments, Debt and Equity Securities [Abstract]  
Schedule of available for sale securities
All investments are classified as available-for-sale and include the following:
 
May 2, 2015
 
January 31, 2015
 
May 3, 2014
(in millions)
Cost
 
Unrealized Gain (Loss)
 
Fair Value
 
Cost
 
Unrealized Gain (Loss)
 
Fair Value
 
Cost
 
Unrealized Gain (Loss)
 
Fair Value
US Treasury securities
$
9.1

 
$
(0.1
)
 
$
9.0

 
$
9.7

 
$
(0.1
)
 
$
9.6

 
n/a
 
n/a
 
n/a
US government agency securities
0.6

 
(0.1
)
 
0.5

 
1.4

 
—

 
1.4

 
n/a
 
n/a
 
n/a
Corporate bonds and notes
10.0

 
0.1

 
10.1

 
10.6

 
0.2

 
10.8

 
n/a
 
n/a
 
n/a
Corporate equity securities
3.4

 
—

 
3.4

 
3.5

 
(0.1
)
 
3.4

 
n/a
 
n/a
 
n/a
Total investments
$
23.1

 
$
(0.1
)
 
$
23.0

 
$
25.2

 
$
—

 
$
25.2

 
n/a
 
n/a
 
n/a
n/a Not applicable as all investments were acquired as part of the Acquisition on May 29, 2014. See Note 3 for additional information.
Investments in debt securities outstanding as of May 2, 2015 mature as follows:
(in millions)
Cost
 
Fair Value
Less than one year
$
0.7

 
$
0.7

Year two through year five
9.6

 
9.4

Year six through year ten
9.3

 
9.4

After ten years
0.1

 
0.1

Total investment in debt securities
$
19.7

 
$
19.6