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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 02, 2019
Nov. 03, 2018
Aug. 03, 2019
Aug. 04, 2018
Operating Loss Carryforwards [Line Items]        
Effective income tax rate (as a percent)     52.20% 24.00%
Measurement period adjustment, tax expense (benefit) $ 25.8 $ (19.6)    
Transition tax liability     $ 23.2  
Aggregate accruals for uncertain tax positions, including penalties and interest 41.4   40.1  
Other long-term liabilities        
Operating Loss Carryforwards [Line Items]        
Transition tax liability $ 25.8   $ 23.2