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Income Taxes - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Income Tax Disclosure [Abstract]      
Effective income tax rate 23.70% 45.10%  
Decrease in income tax expense $ 6.8    
Decrease in reserves for unrecognized tax benefits 10.8    
Decrease in tax impact of internal reorganizations of subsidiaries 3.4    
Decrease due to higher tax credits for research and development 2.0    
Increase in net income taxed at foreign rates 8.5    
Effect of U.S. tax reform, BEAT 2.9    
Possible decrease in tax expense in next 12 months 8.1    
Provision for deferred income tax liabilities $ 17.6   $ 17.4