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Fair Value of Financial Instruments - Schedule of Changes in Level 3 Financial Liabilities (Details) - USD ($)
$ in Millions
9 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 5.5 $ 15.7
Additional contingent consideration incurred 0.9 0.7
Increase (decrease) in contingent consideration liability 0.3 (1.0)
Payments (0.7) (1.0)
Ending balance $ 6.0 $ 14.4