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SHAREHOLDERS' EQUITY: Additional Paid-In Capital (Details) - USD ($)
$ in Millions
3 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Stockholders' Equity [Line Items]    
Share-based compensation $ 2.3 $ 2.0
Stock repurchased during period (in shares) 1,093,679  
Remaining authorized repurchase amount $ 216.0  
Additional Paid-in Capital    
Stockholders' Equity [Line Items]    
Increase (decrease) in additional paid-in capital (18.5)  
Stock repurchased during period, value 19.3  
Adjustments to APIC offset by other stock-based compensation activity $ 1.5