Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Dec. 30, 2017	Dec. 31, 2016	Jul. 01, 2017
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ (1.4)	$ 5.8	$ 1.1	$ 11.5
Tax benefit related to income tax intraperiod tax allocation	0.4		3.1
Tax benefit resulting from Tax Cuts and Jobs Act	6.5		6.5
Change in tax rate, deferred tax asset, tax benefit	4.5		4.5
Change in tax rate, deferred tax liability, tax benefit	2.0		2.0
Unrecognized tax benefits	39.1		39.1		$ 38.9
Interest and penalties accrued	2.1		2.1
Unrecognized tax benefits that may be recognized during the next twelve months	$ 0.1		$ 0.1