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New Accounting Guidance - Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Jul. 01, 2019
Jun. 30, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Present value of lease liabilities $ 549.2    
Operating lease assets 525.8 $ 569.8 $ 0.0
Retained earnings $ 254.7 381.9 $ 323.7
Accounting Standards Update 2016-02      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Present value of lease liabilities   590.5  
Operating lease assets   569.8  
Retained earnings   $ 58.2