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Share-based Compensation (Details) Narrative - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate Intrinsic Value of Share Options $ 12.6    
Aggregate Intrinsic Value of Share Options Vested and Exercised 6.8    
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost 18.6 $ 21.0 $ 26.5
Unrecognized Share Based Compensation Expense $ 16.9    
Unrecognized Share Based Compensation Expense, Recognition Period 1 year 7 months 6 days    
Received from Exercised Share Options $ 19.3 28.1 23.8
Net Realized Tax Benefit of Exercised Share Options 5.5 12.3 22.8
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value 8.3 20.6 37.0
Cash Settled Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost 2.7 2.6 0.0
Employee Service Share-based Compensation, Cash Flow Effect, Cash Used to Settle Awards 2.3 1.6 3.9
Restricted Stock [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost $ 1.6 $ 2.8 $ 0.9