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FINANCING ARRANGEMENTS - Senior Term Notes (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Mar. 31, 2020
Jun. 30, 2018
Jun. 30, 2020
Jun. 30, 2019
Senior Notes | Senior term notes        
Debt Instrument [Line Items]        
Interest rate   5.50%    
Repurchase amount   $ 124.2    
Unamortized premium   1.2    
Repayments of debt   34.2    
Interest expense   1.7    
Revolving Credit Facility | Line of Credit        
Debt Instrument [Line Items]        
Interest rate     5.50% 3.65%
Proceeds from lines of credit $ 183.0 $ 90.0