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Equity Transactions - Vesting (Details)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2017
USD ($)
item
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2017
USD ($)
Employee and Non Employees Stock Option            
Equity Transactions            
Intrinsic value of options exercised         $ 0.1  
Unrecognized compensation $ 1.2     $ 1.2    
Weighted average period for recognition of total unrecognized compensation expense related to unvested stock options granted       1 year 3 months 18 days    
Stock based compensation expense 0.4   $ 0.5 $ 0.8 1.1  
Restricted Stock            
Equity Transactions            
Unrecognized compensation 22.0     $ 22.0    
Weighted average period for recognition of total unrecognized compensation expense related to unvested stock options granted       1 year 7 months 6 days    
Stock based compensation expense 3.9   4.2 $ 7.8 8.2  
Performance Share Units            
Equity Transactions            
Unrecognized compensation 1.4     1.4    
Stock based compensation expense 3.0 $ 3.8 $ 0.0 3.5 $ 0.0  
Performance Shares Tranche #2            
Equity Transactions            
Unrecognized compensation           $ 3.5
Stock based compensation expense $ 2.5     $ 0.0    
Number of performance measures | item 2          
Quarterly Period Beginning November 15, 2017 | Performance Share Units            
Equity Transactions            
Earned award vesting percentage       30.00%    
Period After August 15, 2018 | Performance Share Units            
Equity Transactions            
Earned award vesting percentage       70.00%    
Maximum            
Equity Transactions            
Vesting period.       3 years    
Minimum            
Equity Transactions            
Vesting period.       2 years