Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Mar. 31, 2018	Dec. 30, 2017	Apr. 01, 2017	Mar. 31, 2018	Apr. 01, 2017	Jun. 30, 2018
Operating Loss Carryforwards [Line Items]
Reasonable estimate of income tax expense		$ 35.8
Provisional income tax expense (benefit)		(64.7)
Tax expense (benefit) attributable to income taxes payable and deferred tax assets (liabilities)				$ (14.5)
Transition tax expense (benefit)		$ 115.0
Transition tax as a result of Tax Cuts and Jobs Act, liability, noncurrent	$ 95.0			$ 95.0
Effective income tax rate	9.54%		33.77%	27.97%	34.72%
Effective income tax expense (benefit) attributable to the pension plan				$ (44.4)
Excess tax benefits of equity-based compensation and tax law changes in foreign jurisdictions	$ 14.9			45.7
Unrecognized tax benefits	16.2			16.2
Liability recorded for interest and penalties related to unrecognized tax benefits	$ 12.0			$ 12.0
Scenario, Forecast
Operating Loss Carryforwards [Line Items]
Blended statutory tax rate						28.00%