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Commitments and Contingencies (Narrative) (Details)
CAD in Millions, $ in Millions
12 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2017
CAD
Jun. 30, 2017
USD ($)
Commitment And Contingencies [Line Items]          
Lease expense $ 68.8 $ 53.1 $ 52.3    
Expense related to right-of way, pole attachment and other fees for access $ 65.1 $ 48.9 $ 42.0    
Purchase commitments         $ 379.6
Outstanding letters of credit         7.8
Zayo Canada, Inc          
Commitment And Contingencies [Line Items]          
Letters of credit       CAD 3.4 2.6
Zayo Canada, Inc | Unsecured credit letter agreement          
Commitment And Contingencies [Line Items]          
Letters of credit       CAD 5.0 $ 3.9