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Basis of Presentation - Asset Retirement Obligations (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Changes in asset retirement obligations:    
Balance at Beginning of Period $ 3.6 $ 3.7
Liabilities Incurred 0.7 0.1
Liabilities Settled (0.2) (0.1)
Accretion Expense 0.1 0.2
Revisions to Estimates (0.5) (0.3)
Balance at End of Period $ 3.7 $ 3.6