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New Accounting Pronouncements (Details) - USD ($)
$ in Millions
Sep. 30, 2020
Jun. 30, 2020
Sep. 30, 2019
Jul. 01, 2019
Jun. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Stockholders' equity $ 1,413.8 $ 1,346.5 $ 1,143.4   $ 1,127.5
2016-02          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating lease liability recognized upon adoption       $ 252.0  
Operating lease right-of-use assets recognized upon adoption       $ 235.4