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Income Taxes - Schedule of Reconciliation of Consolidated Provisions for Income Taxes from Continuing Operations (Details) - USD ($) $ in Millions	3 Months Ended								4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 27, 2019	Jan. 26, 2019	Oct. 27, 2018	Jul. 28, 2018	Apr. 28, 2018	Jan. 27, 2018	Oct. 28, 2017	Jul. 29, 2017	Apr. 28, 2018	Dec. 31, 2017	Apr. 27, 2019	Apr. 28, 2018	Apr. 29, 2017
Income Tax Disclosure [Abstract]
Income tax at statutory rate (as a percent)									21.00%	35.00%	21.00%	30.50%	35.00%
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]
Income Tax at Statutory Rate											$ 21.8	$ 37.7	$ 40.5
State Income Taxes, Net of Federal Benefit											(0.8)	0.1	0.9
Dividends											1.8	0.0	0.0
U.S. Tax Reform Transition Tax											(4.8)	48.5	0.0
Foreign Operations with Lower Statutory Rates											(9.6)	(15.3)	(14.5)
Current Taxation of Foreign Income											3.4	0.0	0.0
Foreign Investment Tax Credit	$ 0.2	$ (0.7)	$ (1.1)	$ (0.4)	$ (8.7)	$ (0.3)	$ (0.4)	$ (0.4)			(2.0)	(9.8)	(4.7)
Change in Tax Reserve											(0.1)	0.1	0.1
Change in Valuation Allowance											0.0	0.4	0.3
Tax Rate Change, Foreign											0.0	(1.5)	0.0
U.S. Tax Reform Re-measurements											0.0	5.2	0.0
Other, Net											2.3	1.2	0.4
Total Income Tax Expense											$ 12.0	$ 66.6	$ 23.0
Effective Income Tax Rate											11.60%	53.80%	19.90%

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