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Property, Plant and Equipment - Narrative (Details)
$ in Millions
12 Months Ended
Jun. 30, 2020
USD ($)
facility
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Property, Plant and Equipment [Line Items]      
Depreciation $ 111.0 $ 108.1 $ 104.7
Facility Closing      
Property, Plant and Equipment [Line Items]      
Number of power production facilities closed | facility 2    
Facility Closing | Property, Plant and Equipment      
Property, Plant and Equipment [Line Items]      
Tangible asset impairment charges $ 31.4