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Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended	9 Months Ended
	Mar. 31, 2018	Apr. 01, 2017	Dec. 30, 2017	Mar. 31, 2018	Apr. 01, 2017	Jul. 01, 2017
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 1.1	$ 4.3		$ 2.2	$ 15.8
Tax benefit related to income tax intraperiod tax allocation	4.0			7.1
Tax benefit resulting from Tax Cuts and Jobs Act				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	39.8			39.8		$ 38.9
Interest and penalties accrued	2.2			2.2
Unrecognized tax benefits that may be recognized during the next twelve months	$ 0.6			$ 0.6

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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Amount of income tax expense (benefit) for continuing operations, discontinued operations, other comprehensive income, and items charged (credited) directly to shareholders' equity.

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The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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