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Investments (Tables)
 12 Months Ended
Feb. 02, 2019
Investments, Debt and Equity Securities [Abstract]  
Schedule of Available-for-Sale Securities
All investments are classified as available-for-sale and include the following:
 
February 2, 2019
 
February 3, 2018
(in millions)
Cost
 
Unrealized Gain (Loss)
 
Fair Value
 
Cost
 
Unrealized Gain (Loss)
 
Fair Value
US Treasury securities
$
5.1

 
$
(0.4
)
 
$
4.7

 
$
8.3

 
$
(0.8
)
 
$
7.5

US government agency securities
2.6

 
(0.1
)
 
2.5

 
5.3

 
(0.2
)
 
5.1

Corporate bonds and notes
5.3

 
(0.1
)
 
5.2

 
11.0

 
(0.2
)
 
10.8

Corporate equity securities
2.7

 
(0.3
)
 
2.4

 
3.5

 
1.0

 
4.5

Total investments
$
15.7

 
$
(0.9
)
 
$
14.8

 
$
28.1

 
$
(0.2
)
 
$
27.9

Investments in debt securities outstanding as of February 2, 2019 mature as follows:
(in millions)
Cost
 
Fair Value
Less than one year
$
2.1

 
$
1.8

Year two through year five
9.8

 
9.6

Year six through year ten
1.1

 
1.0

Total investment in debt securities
$
13.0

 
$
12.4