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Revenue Recognition Contractual Liabilities (Tables)
9 Months Ended
Mar. 31, 2020
Revenue Recognition and Deferred Revenue [Abstract]  
Contractual Liabilities Changes in the contract liabilities balance during the nine months ended March 31, 2020 are as follows:
(Dollars in millions)
Contract liability
Balance at June 30, 2019$177.4  
Balance at March 31, 2020$180.0  
Revenue recognized in the period from:
Amounts included in contract liability at the beginning of the period$117.2