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Fair Value Measurements - Changes in Fair Value of Level 3 Contingent Consideration (Details) - Level 3 - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Measured at fair value on recurring basis | Contingent consideration        
Fair Value Liabilities [Roll Forward]        
Balance at beginning of period     $ 0.8 $ 25.4
Additions due to acquisitions     4.1 0.0
Payments     0.0 (19.3)
Fair value adjustment of contingent consideration     0.3 (0.1)
Balance at end of period $ 5.2 $ 6.0 5.2 6.0
Fair Value, Nonrecurring | Two Thousand Eighteen Trademarks        
Fair Value Assets [Roll Forward]        
Balance at beginning of period       0.0
Impairment   0.0    
Fair Value, Nonrecurring | Two Thousand Nineteen Trademarks        
Fair Value Assets [Roll Forward]        
Balance at beginning of period     5.2  
Impairment (5.2)      
Fair Value, Nonrecurring | Trademarks        
Fair Value Assets [Roll Forward]        
Balance at end of period $ 0.0 $ 0.0 $ 0.0 $ 0.0