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Income Taxes - Tax Reform (Details) - USD ($)
$ in Millions
3 Months Ended 7 Months Ended 9 Months Ended 12 Months Ended
Jul. 29, 2018
Jul. 29, 2018
Jul. 29, 2018
Oct. 28, 2018
Dec. 31, 2017
U.S. Tax Reform          
Corporate federal statutory tax rate (as a percent)   21.00%     35.00%
Deemed repatriation tax payment period     8 years    
Net deferred tax liability remeasurement $ 3.6   $ 326.0    
Deemed earnings repatriation tax     (15.7)    
Total discrete tax benefit (expense) $ 3.6   $ 310.3    
Forecasted          
U.S. Tax Reform          
Corporate federal statutory tax rate (as a percent)       23.30%