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Share-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Millions
6 Months Ended 12 Months Ended 97 Months Ended
Dec. 31, 2020
USD ($)
d
$ / shares
shares
Jun. 30, 2020
USD ($)
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Dec. 31, 2020
USD ($)
shares
Dec. 05, 2012
shares
Share-based Compensation [Line Items]            
Options granted (shares) | shares 700,000 0 0 0    
Unrecognized share-based compensation expense related to stock options | $ $ 4.6       $ 4.6  
Fair value of restricted stock units vested during period | $ $ 29.1          
Options and RSUs | Non-employee director            
Share-based Compensation [Line Items]            
Service period for award vesting (in years) 1 year          
Stock options            
Share-based Compensation [Line Items]            
Service period for award vesting (in years) 4 years          
Unrecognized share-based compensation expense, weighted-average period for recognition 2 years 6 months          
Stock options | President and Chief Executive Officer            
Share-based Compensation [Line Items]            
Stock price consecutive days threshold for award vesting condition | d 20          
Stock options | Awards granted after December 5, 2012            
Share-based Compensation [Line Items]            
Award expiration period (in years) 8 years          
Stock options | Awards granted prior to December 5, 2012            
Share-based Compensation [Line Items]            
Award expiration period (in years) 10 years          
RSUs            
Share-based Compensation [Line Items]            
Service period for award vesting (in years) 4 years          
Weighted average grant date fair value (dollars per share) | $ / shares $ 13.69 $ 27.96 $ 46.62 $ 32.67    
Fair value of restricted stock units vested during period | $   $ 32.4 $ 27.6 $ 20.4    
Unrecognized share-based compensation expense | $ $ 54.3       $ 54.3  
Unrecognized share-based compensation expense, weighted-average period for recognition 2 years 8 months 12 days          
Performance Share Units | Achievement levels based on EPS targets            
Share-based Compensation [Line Items]            
Vesting weight (percent) 50.00%          
Performance Share Units | Performance based on Nasdaq Healthcare Provider Index            
Share-based Compensation [Line Items]            
Vesting weight (percent) 50.00%          
2017 Plan            
Share-based Compensation [Line Items]            
Shares available for future grant | shares 4,600,000       4,600,000  
2010 Plan | Options and RSUs            
Share-based Compensation [Line Items]            
Additional shares available for future grant | shares 4,000,000.0          
2012 Purchase Plan            
Share-based Compensation [Line Items]            
Shares available for future grant | shares           2,000,000.0
Unrecognized share-based compensation expense | $   $ 0.5        
Shares issued under the Plan | shares         1,800,000