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Stock-Based Compensation (Narrative) (Details) - USD ($)
3 Months Ended 12 Months Ended
Oct. 16, 2014
Oct. 09, 2014
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                            
Reclassification of common unit liability to additional paid in capital                         $ 490,200,000  
Common stock distributed in connection with non-liquidating distribution   20,460,047                        
Adjustment to additional paid in capital fair value adjustment share based compensation awards                       $ 12,900,000    
Number of RSUs, Granted                     47,420 41,793    
PCIP [Member]                            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                            
Incentive plan termination period 10 years                          
Part A Restricted Stock Units [Member]                            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                            
Common unit unvested     2,364,386       2,169,901       2,364,386 2,169,901 933,217
Unrecognized compensation cost     $ 36,600,000               $ 36,600,000      
Award recorded as liability     $ 5,500,000       $ 2,000,000       $ 5,500,000 $ 2,000,000    
Number of RSUs, Granted                     2,678,503 2,190,785 955,831  
Part B Restricted Stock Units [Member]                            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                            
Shares authorized     550,109 880,564 981,817 1,030,185 1,606,332 1,463,733 1,449,860 1,426,812 550,109 1,606,332    
Common unit unvested     411,973       860,936       411,973 860,936 1,249,873  
Unrecognized compensation cost     $ 8,000,000               $ 8,000,000      
Number of RSUs, Granted     152,808 171,316 191,015 200,425 312,516 284,773 282,074 272,813 715,564 1,152,176 1,251,671  
Restricted Stock Units (RSUs) [Member]                            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                            
Performance price                     1 year      
Average closing price                     10 days      
CII [Member]                            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                            
Shares authorized     625,000,000               625,000,000      
CII [Member] | Common Units [Member]                            
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                            
Shares authorized     625,000,000               625,000,000      
Unrecognized compensation cost     $ 0               $ 0