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Accounting Policies and Recent Accounting Pronouncements - Capitalized Software (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Property, Plant and Equipment [Line Items]    
Capitalized software development costs $ 67.1 $ 53.5
Additions related to capitalized software development costs $ 12.8 $ 14.9
Capitalized software development costs | Minimum    
Property, Plant and Equipment [Line Items]    
Useful life 5 years  
Capitalized software development costs | Maximum    
Property, Plant and Equipment [Line Items]    
Useful life 7 years