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Supplemental Cash Flow Information (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Dec. 31, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Supplemental Cash Flow Elements [Abstract]        
Cash paid for income taxes $ 1.8 $ 1.0 $ 6.5 $ 11.7
Cash paid for interest 5.2 9.5 11.6 3.0
Non-cash investing and financing activities:        
Fair value adjustment on marketable investment securities recorded to stockholders' equity $ (0.5) 0.7 $ 1.2 $ (0.4)
Establishment of operation lease right-of-use assets and lease liabilities        
Accrued liabilities and other long-term liabilities   4.3    
ASU 2016-02        
Establishment of operation lease right-of-use assets and lease liabilities        
Operating lease right-of-use assets   74.5    
Operating lease liabilities   $ (78.8)