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New Accounting Guidance (Tables)
9 Months Ended
Mar. 31, 2020
Accounting Policies [Abstract]  
Schedule of Impact of Adoption of New Leasing Standard in Company's Unaudited Condensed Consolidated Balance Sheet The complete impact of the changes made to the Company's unaudited condensed consolidated balance sheet due to the adoption of the new leasing guidance were as follows:
($ in millions)June 30, 2019Adjustments due to AdoptionAt July 1, 2019
Operating lease assets—  569.8  569.8  
Other current liabilities1,044.9  54.3  1,099.2  
Operating lease liabilities—  506.8  506.8  
Deferred tax liabilities1,011.7  18.7  1,030.4  
Other non-current liabilities241.0  (68.2) 172.8  
Retained earnings323.7  58.2  381.9