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Other Non-Current Assets - Schedule of Other Non-Current Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Jun. 30, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Deferred client conversion and start-up costs $ 168.5 $ 162.4
Deferred data center costs 39.2 40.1
Long-term investments 73.2 63.4
Long-term broker fees 25.9 24.2
Other 28.6 26.4
Total $ 335.5 $ 316.4