Investments - Summary of Available-for-sale Securities (Details) - USD ($) $ in Millions	Jan. 30, 2021	Feb. 01, 2020
Debt Securities, Available-for-sale [Line Items]
Total investment in debt securities	$ 14.9	$ 20.1
Unrealized Gain (Loss)	0.5	0.3
Fair Value	15.4	20.4
US Treasury securities
Debt Securities, Available-for-sale [Line Items]
Total investment in debt securities	5.6	7.2
Unrealized Gain (Loss)	0.1	0.0
Fair Value	5.7	7.2
US government agency securities
Debt Securities, Available-for-sale [Line Items]
Total investment in debt securities	3.1	4.6
Unrealized Gain (Loss)	0.1	0.1
Fair Value	3.2	4.7
Corporate bonds and notes
Debt Securities, Available-for-sale [Line Items]
Total investment in debt securities	6.2	8.3
Unrealized Gain (Loss)	0.3	0.2
Fair Value	$ 6.5	$ 8.5